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If there is a small space between the door and the frame, you can see the bolt. Use a small knife to inch the bolt back, then when the end of the bolt is far enough out slide your knife in front of it and boom your door will open. Also if you take a butter knife and hook the tip just a bit, you can finagle it into the hole where the bolt is in the door and pull it out. If its a normal handle lock your dealing with slide something thin and hard between the door and frame.
Contributed by Nicole Hunter