Well, I’d recommend YouTube. Look into some locksmithing and lockpicking videos and tutorials, see if those look interesting to you. If the answer is yes, then you can seek to get formal training in the field.
Locksmithing training is usually provided by vocational schools and community colleges. Some basic training courses take under a week, but longer courses will give you more in-depth knowledge.
After your studies are done, the best next step is to work as an apprentice. This will give you the experience you need to do the job well, and it’ll increase your chances of being hired when you start job hunting. You may also need to obtain a locksmithing license, depending on which state you live in. 15 states require that locksmiths have a license.
When it is time for you to look for locksmith jobs, sites like this can help.