I lost a key to my security door. I want to ask the locksmith in the community to change the lock core. Is it safe? Where should I go to find a locksmith to change the lock core to be safe?

Don't worry if you change the lock core, because the lock core is equipped with two sets of keys. One set is for the test after the test, and when you open the door with the key of the other set after the test, the original set of keys for the test will lose its function, so my family changed it. The trial suit is used by the decoration workers when it is convenient to decorate. If it is decorated, reopen the door with another set of keys. The key will change a part in the lock core, and the key in the hand of the decoration worker will lose its function.