Forgot to pull out the key when you entered the door?

There is no need to change the lock in this case. What I'm afraid of. They deliver takeout food, so I probably didn't notice if there was a key on your door. In addition, generally speaking, normal people will not immediately think of matching your keys and do bad things in the future. I often forget to pull out the key, and it takes a long time to find that you really don't trust to change the lock core.