That's exactly what I would think if I were in trouble and hadn't done any research, but in fact it is not. When I needed a locksmith a few years ago, at night, it cost $70.

Probably depends highly on location, company and type of lock. I needed to get into my mailbox after losing the keys. They wanted 150 for literally 5 minutes with a screwdriver (lesson learned!). Of course I'm paying for those years of experience as well as the drive over. I was able to talk them down to 120. Oh and it was during the weekday! I also did research prior and called a few places, they all basically said the same thing: "depends on the lock but probably minimum 100".