Historically, lock techs were, as the name implies, artisans who created entire locks or security systems by working with metal, using files, forges, and other tools to create and fine tune the mechanism. A Beaverton lock repair pro, rather than just creating a few locks in a lifetime is more likely to fine tune, repair and consult on entire security systems. Mass production has removed much of the need for expertise in creating a key. Many hardware stores have a machine that will duplicate a key.