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You can also grind it over there with a pencil lead, and you can put some oil.
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Replace it early, and the eggs inside appear to loosen.
B&Q building materials market exists, but you need to find it yourself.
Go buy a bottle of sewing oil, open it, and squeeze it directly at the keyhole for immediate effect. It's just that the first two times the key is used, it will bring a little oil, and it will be clean when wiped with paper.
The most common security door lock keys are 6, and there are also 5 and 3 but rarely.
The most accurate way to do this is to remove the cylinder and measure it. >>>More
No, you'll have to change the cylinder.
You can remove the lock cylinder as follows: first remove the doorknob, and then unscrew it on the side of the lock, and the lock cylinder can be removed. Then go to the hardware store and buy the same lock cylinder and install it in the same way. >>>More