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Haha,My family sells security doors,.It's actually quite simple:Remove the lock, open it, and poke the key out insideAfter installing it, press it again and it's OK. Give it a try and wish you success.
Prepare props: a slot, a Phillips screwdriver, 2 pliers, 2 sewing needles, 1 tweezers. >>>More
If there is a little bit on the outside, you can clip it out with nail clippers, and if it is broken inside, you can only call the lock cylinder to be unlocked.
What to do if the cross security door key is broken in the lock: >>>More
Use a magnet or glue dipped in glue into the key hole to take out the broken one.
It's the handle lock, and you remove the handle, and the lid of the lock is removed, and it's under the big deadbolt on the side, and the big screw on the top of the reverse deadbolt is the rest, and if you remove all of that, you're going to have trouble.