A locksmith in Tulsa handed me his pick set and said 'try it yourself,' and that 20 minutes changed how I see locks | Ask a Weird Expert - Pinecone Attack
So he just let a random person poke around his livelihood for 20 minutes because... why not? Next time I'm at the dentist I'll ask to drill my own filling and see how that goes. Funny thing is, that locksmith probably created a hobbyist for life and didn't even charge for it.