24HOUR LOCKSMITH SERVICE FOR RESIDENTIAL & VEHICLE. Locksmiths are skilled tradesman who install, adjust, and repair commercial, residential and automotive locks and security devices. Locksmiths fabricate and duplicate locking keys, change lock combinations, and bypass locks when authorized. Their skill and knowledge in installing and repairing conventional security hardware and lock sets take them to work in residential, commercial and industrial establishments that require varying levels of physical security to protection them from unauthorized entry.