About Us Bob's Lock Service is an owner operated mobile locksmith service. We provide fast emergency service if you are locked out or need repairs. We also offer expert service for any type of residential or commercial building, as well as automotive work. Our prices are very reasonable and we are honest with everyone. Service areas include Aston, Delaware County, Brookhaven, Boothwyn, Chichester, Chester, Marcus Hook, Glen Mills, Chadds Ford, Garnet Valley, Media, Wallingford, Concordville, Newtown Square,West Chester, Paoli, Main Line, Philadelphia and all surrounding areas.