I think it's a waste of money if you don't do locksmith work on a professional level. I used to think that being a locksmith was very easy, but my opinion changed when my brother was trained and told me all the nuances of his job. It turns out that it is a very diverse profession that requires a great deal of knowledge. The most important of all is the ability to communicate with people and adequately understand their problems. To be a good locksmith, you need to have a lot of skills. You can also read this article https://www.howtobecomealocksmith.org/how-to-become-a-commercial-locksmith/ to see how difficult it is. I don't envy my brother.