To open a door with a credit card start by sliding the card in the gap between the doorknob and the frame.
How to pick a lock on a door with a card.
How to pick a lock with a credit card.
You can push on the door itself with the force of your body to reveal a piece of the door jam.
Once the corner is in straighten the card so that it is perpendicular to the door and the entire edge of the card is between the door and the strike plate.
Begin just above the door handle and slide the card downwards and in.
Insert the card between the door and the frame.
At an angle slide the edge of your card between the door and the strike plate.
The card will have to bend to make it in.
Put the credit card in the slit just between the door and the jam try to get it in there as far as you possibly can.
Make sure you are inserting the credit card at a ninety degree angle along with the door.
You may have to wiggle it a bit but if you are lucky the card will press against the latch assembly and allow you to open the door.
Take the card and slide it into the gap between the door and the doorjamb.
Next bend the end of the card back toward the frame which will cause the card to slip under the latch and unlock the door.