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The deadbolt and the keyhole have been misaligned, and it is recommended to find a professional master with a store to come to the door for maintenance.
Hello, this is a good solution. There are three methods, one is to scrape some pencil powder with a knife yourself, sprinkle it on the key, and then insert it into the keyhole to let the powder enter the lock cylinder. Two kinds of hardware store or binary store to buy "sewing machine oil", must be this oil other can not, this is great, not easy to insert the key, the door is not easy to hit, just a little lower. >>>More
The lock cylinder is broken! It is recommended to take a few more keys and try to add some vegetable oil to the lock cylinder, but only to change the lock cylinder.
Spray some anti-rust lubricating oil first (generally sold in hardware stores). >>>More
Maybe the lock cylinder is a little rusty. You can put some oil on the key and turn it on again. More lubrication is the last word. >>>More
The fastest way is to reset the pins, if you can't reset them, drill the lock cylinder with an electric drill, take out all the pins and then unscrew the lock cylinder to replace it.