Insert the knife between the space in the door and the frame where the lock is situated since knives are thin it should easily slide in between the lock and the frame.
How to unlock a locked door with a knife.
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However it would help if you had the talent to solve any basic entrance deadbolt with ease.
You may also need to tilt the knife a little till you find the suitable angle for moving the lock.
If a deadbolt gets escorted by a lock in addition to a deadbolt then a butter knife will not unavoidably work.
Apply pressure on the lock using knife and push it back in the door.
Pry open the latch by sweeping the end of the knife and moving the latch inward.
Take the butter knife and slide it between the door and the door frame starting about three inches at the top of the door knob.
Start by sliding the knife in above the door lock in between the door and door jam then slide it down until it stops sliding that means you found where the lock goes into the door step 2 once you have located where the bolt goes into the door it s time to apply some downward pressure and start picking.
Push the knife in working it until you slide the bolt out of the door jamb.
You may want a minor knife edge to achieve this.