If it is slide a credit card you don t mind damaging between the lock and the door frame.
How to open a lock door from the outside.
Step 3 turn the doorknob and try to open the door.
If the locking mechanism is a latchbolt the kind of bolt that is spring loaded and has one angled edge and the angled edge is facing away from you you can hook it with a wire hanger.
Both methods require manipulating the material so that the chain end is pulled towards the wider slot that will make the chain fall out hence unlocking the door.
A spring lock is slanted and is part of the handle.
Bend the card back towards the frame to force the lock into the door.
To unlock the door from the outside to unlock from the outside you need to add a lock cylinder installing it so that the spindle is inserted into the flat hole next to the release lever.
Depending on how the deadbolt lock is installed in your door you may need to pull the door closed a little tighter to line up the deadbolt and the strike plate.
All you need is some kind of string dental floss yarn ribbon etc or a sturdy rubber band the thicker the better so it won t snap under pressure.
To open a locked door without a key first see if the lock is a spring lock.
This will trigger the release lever and the bolt should spring open.
Insert the deadbolt key into the deadbolt lock and turn the key to the left to initiate the lock.