Look for the set screw on neck of the knob between the handle and door.
Front door wont open when unlocked.
Place a large flat head screwdriver at the top of the hinge just under the large pin head that holds it in place.
Use a hammer to tap up the.
Take the door off the hinges.
If you can see the door hinges you can open the door.
Insert a long sturdy item with a flat tip preferably a flat head screwdriver if available between the top rung of the door s top hinge and the head of the bolt securing the door to the hinge.
Getting the door to open every door is different so there isn t one fool proof way to coax them open.
If the door does not allow the lock to be jimmied open it may be necessary to remove the door from its hinges.
If the bolt moves but not enough to allow the door to open the mechanism probably needs lubrication.
Make sure that the lock is not frozen shut.
The lock cylinder may be broken so that you cannot use your key or anything else to move your door lock into the unlocked position.
This is largely a matter of trial and error and may require muscle and a bit of teamwork.