Yes, a locksmith can help you program a key fob. Small devices called key fobs emit a message that electronic locks can detect. In order to unlock the door or start your car, the lock must disengage in response to this signal. Keyless entry, which employs a key fob rather than a key, is a feature of many more recent car models. Locksmiths can program a new key fob for you if you lose your old one.