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The thief is unlikely, maybe he offended someone.
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Thief, the oiled keyhole should be opened a little better with a master key.
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Possibly, ask your family, if no one moves, it is a thief, change the lock in time.
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You see if something is missing, and if it is, there is probably a thief; If it's not less, it may be a natural phenomenon, weather conditions, or something like that.
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Maybe it's better for you to clean it up.
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Possibly, be on the safe side and change the locks.
Find a professional maintenance master with a store to repair or replace it.
Grade lock cylinder, with technical opening time within 1 minute. >>>More
In the case described by the landlord, the installed bolts should be loose. You can call to clarify the situation and let the manufacturer come to the door for refurbishment. I hope my answer can help you.
There are several possibilities that the security door cannot be opened. >>>More
How to open a Class C anti-theft door lock.
2. Class C lock is a more complex type of lock cylinder on the market, and the key is also a more complex result, so the safety factor is relatively high, except for the damage. The likelihood of theft is relatively small. Therefore, the safety factor and price of C-class lock cylinder will be higher. >>>More