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Try to hook it out slowly with a thin wire.
If someone in the room can open the door, then you can directly remove it, a total of three screws, two panel screws (at the indoor end), a lock cylinder fixing screw (in the middle and lower part of the lock body baffle on the door side), if you can't take it out, directly use a pipe pliers to break the lock cylinder, take it out, and then replace the lock cylinder. >>>More
Prepare props: a slot, a Phillips screwdriver, 2 pliers, 2 sewing needles, 1 tweezers. >>>More
You can remove the lock cylinder and insert it on the reverse side of the lock cylinder with a small sturdy iron rod or something to see if you can push out the key that is broken inside.
Find a small spring to straighten, flatten a little with a hammer, and then file the barb, carefully put it in, and pull it out hard.
Take a wooden stick, dip some 502 glue on the head, and then fix it on the key head that is broken inside, and when the glue is dry, pull it out.