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Looking for the whole thing to open the lock, I have encountered this situation, it costs a hundred yuan to open the lock, and I feel slaughtered.
The lockpicker first removed the cat's eye, then took out a homemade tool and stuck it in the doorknob, and then the doorknob was unscrewed inside to open the door.
I knew that the key was piggyback on the inside, and I couldn't open it even if there was a key outside. But I don't know if your locksmith has this unlocking technique.
What to do if the cross security door key is broken in the lock: >>>More
The anti-theft door key is inside, what to do if the door is closed, the key is inserted in the door >>>More
There are several reasons and solutions for the security door to not open from the inside: >>>More
Is the anti-lock under your key open? If you can't open it, remove the screws, and then buy a lock cylinder to replace it.
Call 114 to find a lockpicking company to deal with it. Or find a way to find the key. See if you forgot where you lost the key.