Fame

We hope you're not looking to become famous as a locksmith because chances are good that people won't even refer to you by name—instead they'll call you "that locksmith" (or possibly "The Keymaster" for people who like good movies). You can still make your local newspaper if you save the day in a particularly high-stakes case (say, a daycare teacher accidentally gets locked outside while all the kids are still inside), but in general, your vocation isn't exactly front-page news.

 
That's certainly one way to make a living. (Source)

The most famous locksmiths are the ones who invented locks we use today, mostly English, and they haven't been around in at least a hundred years to enjoy the spoils of their work. Ever heard of Jeremiah Chubb? Well, besides having an incredible name, he made something called a "detector lock," which basically froze if someone tried to get in using the wrong key (source). As you can imagine, he's, like, a complete rock star in the world of locks.

There is, of course, one person who worked with locks that you may have heard of: world famous magician Harry Houdini. Although if you want to emulate him, we're not sure you're in the right place.