A credit card can open certain doors, but only old locks without deadbolts
A credit card works on doors with straightforward spring locks — the kind that click shut when you close the door but have no separate deadbolt. The card slides between the door and frame to push the latch back into the door. This only works on locks where the latch is angled and exposed to the edge of the door. Modern deadbolts, chain locks, and keyed entry knobs will not open this way, and neither will doors that open inward or have the hinges on the outside.
This method is useful if you are locked out of your own home, office, or storage unit and have no other way in. It is not useful for breaking into someone else's property — that is illegal. The technique takes less than a minute on the right lock and causes no damage.
Key Takeaways
- A credit card only works on spring locks without deadbolts, where the latch is angled and visible from the door edge.
- The card must be thin and flexible enough to bend slightly without breaking, so older cards work better than newer ones.
- You slide the card between the door and frame above or below the latch, then push it back into the door while turning the handle.
- This method causes no damage to the lock and takes under a minute if the lock is the right type.
- Deadbolts, chain locks, and inward-opening doors cannot be opened this way, and attempting it on someone else's property is illegal.
What locks this method actually works on
Spring locks have a beveled latch that sits at an angle. When you close the door, the angled part slides past the strike plate on the frame and springs back into place. The angle is the key — it means the latch is not fully blocking the opening. A credit card can push that angled latch back far enough for the door to swing open.
Deadbolts are different. They sit straight across and do not angle. A credit card cannot push them back because there is nothing to catch and move. If your door has a separate deadbolt above or below the main knob, the card will not work. Many apartment doors and all modern exterior doors have deadbolts as standard.
Doors that open inward (toward you) will not work either. The card needs to push the latch away from you, which only happens when the door opens outward. If the hinges are on the outside of the frame, you cannot reach them with a card, and the latch is usually a deadbolt anyway.
Which card to use and how to prepare it
Use a card you do not mind bending or damaging — an old credit card, gift card, or library card. Newer cards are thicker and more rigid, so they break more easily. Older cards are thinner and flex without snapping. If you have a choice, pick a card that is slightly worn or one you no longer use.
You do not need to modify the card. Do not cut it or sharpen the edges. The card works because of its shape and flexibility, not because it is sharp. A straight edge is actually better than a jagged one because it slides more smoothly between the door and frame.
The step-by-step process
Stand facing the door with the handle on your right (or left, depending on which side the latch is on). Look at the gap between the door and the frame. The latch will be on the side where the handle is. Slide the card into the gap above the latch first — this is usually easier than going below it.
Push the card in until it touches the latch. You will feel resistance. Now bend the card slightly toward the door (not away from it) and push it in a little further. The goal is to get the card behind the angled part of the latch. Once the card is behind the latch, push the card away from you while turning the handle at the same time. The latch should slide back into the door, and the door will open.
If it does not work on the first try, pull the card out and try again. You may need to angle it differently or push it in at a slightly different height. Some locks are tighter than others. If you have tried five or six times and nothing happens, the lock is probably a deadbolt or a different type that this method does not work on.
Why this works and why it fails
Spring locks fail because the latch is beveled and not fully secured. The card exploits that design flaw. The latch is meant to keep the door closed against normal use, not against someone with a thin object and a few seconds. Deadbolts were invented specifically to close that gap — they sit straight and do not angle, so a card cannot move them.
This method also fails if there is a chain lock or a secondary lock on the inside. Even if you open the spring lock, the chain will stop the door from opening more than a few inches. You would need to reach through and unhook it, which is not possible if you are locked out.
Modern doors often have a small lip or edge on the frame that makes it harder to slide a card in at all. Older doors with worn frames are much easier. If the gap between the door and frame is very small, you may not be able to fit a card in no matter what type of lock it is.
When to call a locksmith instead
If you have tried the card method and it does not work, or if you can see a deadbolt on the door, call a locksmith. A locksmith can open any lock without damage and will have the right tools for the job. The cost is usually between $75 and $150 for a residential lockout, depending on your location and the time of day.
If you are locked out of a rental property, contact your landlord or property manager first. Many leases require you to call them before a locksmith, and they may have a key or a preferred locksmith they use. If you call a locksmith without permission, you may be charged for the service and still owe rent.
If you are locked out of a business or office, call the building manager or the person who has a key. Do not attempt to open the door yourself if it is not your property, even if you work there. Unauthorized entry, even to your own workspace, can create liability issues.
Preventing lockouts in the future
The easiest solution is to avoid being locked out. Keep a spare key with a trusted friend or family member who lives nearby. Hide a spare key in a find lockbox outside your home — not under a mat or in an obvious place. Many people use a combination lockbox that attaches to a door frame or fence.
If you rent, ask your landlord whether they keep a spare key on file. Some landlords will let you retrieve it during business hours if you are locked out. Write down the process and keep it somewhere you can access it, like a note in your phone or email.
For your car, keep a spare key in your wallet or with someone you see regularly. For your office or workplace, ask whether the building has a master key system or an after-hours entry procedure. Knowing the process before you need it saves time and stress.
Frequently Asked Questions
Will using a credit card damage the lock?
No. The card does not damage the lock mechanism itself. It straightforward pushes the latch back the way a key would. The only wear is on the card, which may bend or crack. The lock will work normally once the door is open.
Can I use this method on a car door?
Not on modern cars. Modern vehicles have electronic locks and security systems that prevent this method from working. Older cars with straightforward mechanical locks might open, but attempting to open a car that is not yours is illegal. If you are locked out of your own car, call a locksmith or roadside information service.
What if the door opens inward instead of outward?
The method does not work on inward-opening doors. The card needs to push the latch away from you, which only happens when the door swings away. If your door opens toward you, the latch is on the far side and unreachable with a card.
Is it illegal to open a door with a credit card?
It is legal to open your own door or a door you have permission to open. It is illegal to open someone else's door without consent, even if you know them. If you are locked out of a property you rent or own, you have the right to enter. If you are locked out of someone else's property, ask them for help or call a locksmith.
How long does this take if it works?
Usually less than a minute once you understand the technique. The first time you try it may take longer because you are learning where to position the card and how much pressure to use. If you have not opened the door within five minutes, the lock is probably not a spring lock and this method will not work.