There is a saying in the security industry that "locks keep only honest people out." It is for this same reason that there is a huge demand for locksmiths. A lot of homeowners need the services of a locksmith when they get locked outside their homes and they are kept out by their own locks.
There is a common misconception that locksmiths only pick locks. While it is true that this is their best known task, they also do several other things. This is why not everyone can be one. Sure, anyone can easily learn how to pick locks thanks to YouTube tutorials, but one also has to know how to do the following things to be considered a well-rounded locksmith:
Create duplicate keys
Install, modify, repair and re-key locks
Sell and install safes