My mother locked her keys inside an interior room of the house. I was away so I called this service. The door is a doorknob lock, very simple. They said they'd send someone and the cost should be around 85$. The technician took 45 minutes longer than his original estimate to arrive, spent 2 minutes on the door and charged 200$ to my mother who didn't know any better. I think this is dishonest business practice and I recommend anyone who use this service to ask about the price and agree on something ahead of time.