Locksmiths are sort of a weird case: you can learn to open 95%+ of commercially relevant locks with $100 of tools and less than an hour of training. The biggest reason it costs $150 and not $25 is that your locality makes it illegal to advertise as a locksmith, and illegal to possess locksmithing tools, without certification. There's a nebulous security rationale for this, because apparently normal people can be allowed to own credit cards and compressed air cans but if we allow them to open locks for money as well then they'll burglarize every house in sight.
If locksmithing tools are outlawed, then only outlaws will have locksmithing tools.
From that perspective, the ban makes sense, kind of. If the police catch a burglar with locksmithing tools, then he's automatically a criminal, even if they can't prove he broke into anybody's houses. What if he's not a burglar? Well, law-abiding citizens by definition wouldn't have those tools, unless they have the appropriate certification, which the police can of course check.
It serves as a convenient filter to lower the bar to being able to arrest burglars. Of course, there's the question of whether there are legitimate reasons for non-certified people to have these tools, and whether the tradeoff is worth it (I'd certainly lean toward "no" there, since it seems like a big restriction of freedom for a minor gain), but on its face the prohibition is not completely absurd.
It very much depends on which locality you are in. In plenty of places it is legal to own locksmithing tools. You can find many videos of lockpicking on youtube.
