Just Google, Locksmith Scams and many news articles and videos will pop up. For around 30 years a Nationwide Network of SCAMMERS have been operating in the United States in the Locksmith Field. Tactics include quoting low price up front, only to charge much higher upon arrival; as well as telling customers their lock can't be picked and has to be drilled and replaced etc. 
Unfortunately, you can't always go by the reviews for the company you are considering, as there are ways for bad reviews to get "scrubbed". 
These companies are mobile only, meaning they do not have a shop. They don't want you to find them after the service. That is NOT to say that all mobile only locksmiths are scammers. Quite the contrary; if you get referred a mobile only locksmith by a friend who had a good experience, that's totally different. 
Some Scammers have even gone so far as to advertise "their" business address and no business is there at all, or a totally different business. We recommend you Google any address you see in locksmith advertising, and use Street View to see if there is a locksmith there.
We invite anyone to stop at our shop and check us out. We have been at the Park Blvd location since 1990. Do yourself a favor and put our phone number in your contacts under locksmith.That bypasses the Scammers altogether.