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Anonymous users2024-01-24Now the market is used AB locks, there is no C key, generally A key 5 pieces (for the owner), B key 2 pieces (for decoration). If the A key is rotated 360 degrees in the lock cylinder, the B key will automatically become invalid and the door will not be opened. It is also a reason to change the lock, a lock with a set of AB keys.
In real life, when people encounter that the door lock is not easy to open, they will generally lubricate the lock cylinder with oil, although it can solve the problem, but if you do it often, a large amount of dust will enter and mix with the oil, which is not good for the door lock. I think the best way to do this is to scrape the pencil into lead powder and lubricate the lock cylinder, which works very well and does not damage the lock.
If they're open, take the cylinder off, and use the pliers to turn the cylinder key and try to take it out, and you can give it a try.
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