Remove the Doorknobs and Deadbolts.
What is a hinge door?
A hinged door is one that is suspended in a passageway by several hinges on one side that connect it to the wall and allow it to swing open and closed. The door can then be pushed or pulled to open and close it. Most hinged doors swing only in one direction and when closed lie flush to the door jamb.
Reference: www.windowsandsiding.net/doors/faq/what-is-a-hinged-door/
Should doors swing in or out?
The home building industry is ruled by codes, but the International Residential Code doesn’t have a requirement for swing direction. The rule of thumb is to hang interior doors to open into the room, not out into a hallway or other common area.
How to pick a locked door with a paper clip?
How to Pick Simple Locks/Latches With a Paper Clip
One Key Multiple Door Locks