If you want to impress the locksmith, I would recommend bringing your pickset but don't even pull it out until you've engrossed him in conversation regarding all other aspects of locksmithing and what interests you about it.
Picking locks is not locksmithing. Hanging doors, fitting locks, rekeying locks, cutting duplicates, etc... is locksmithing. Only then, you should casually mention that you enjoy hobby lock-picking and see if this perks his interest, and he will supply you with locks to pick as a friendly side conversation unrelated to work.