If you’re in another country like Australia or South Korea, use the largest and thickest coin possible. [2] X Research source
Place the coin between the edge of the door and the door frame. About half the coin should be between the door and frame. Move the coin upward slightly and push it into the door’s hinge. Let the door close. With luck, the door should be propped open just slightly to the point you can push the door open without during the handle.
You may want to place the coin over the door’s latch. This can hold the door handle at an open angle, allowing you to push the door open and closed without turning the knob. This will also prevent the door from locking. However, placing the coin on the door latch may not hold the door open. Depending on the gap between your door and door frame, it may just allow you to push the door open and closed.