Are you talking about a Yale lock or similar and you are lubricating the part of the lock where the key goes in ? If so, yes, I'd leave it for a while. Often graphite powder is the suggested lubricant.
Commercial and trade operators often or usually use 110v power tools. Some comments say the reason is that the lower voltage reduces the impact of an electric shock. On it's own, that makes sense. However, I thought that: (1) it's more the current (amps) that kill (2) Using a transformer to reduce 2...
