If someone is a skilled locksmith, it doesn't take much longer to do it by hand. Most doors and locks don't take much more than 30s to rake, and maybe a minute or two to pick. The pick gun is conceptually/mechanically the same as raking a lock, with the same limitations, but it requires no skill or practice in comparison (it's really a rake gun, not a pick gun, and can't defeat higher quality locks).

So as someone with some knowledge of the profession, I would tip a locksmith far more if they picked it by hand in display of skill and dedication than if they resorted to no-skill tools, especially since it will probably take the same amount of my time.