Can you use a credit card to open a locked door?
Unfortunately, you can not unlock a deadbolt with a credit card. Credit cards will only work with slanted-latch-style locks. Furthermore, the slant of the latch must be facing you so that you may press it in using your card.
How do you open a door from the outside with a credit card?
Doing the Basic Technique. Slide the card into the vertical crack between the door and frame. Insert the card into the gap between the doorknob and door frame and then slide it down next to the doorknob. Push it in as far as it will go at a ninety degree angle to the door.