I thought it may be interesting to start a thread on none woodworking hints and tips
My tip told to me by an old locksmith
Powdered graphite is the traditional material for lubricating pin tumbler locks. You can even buy powdered graphite that comes in a little tube with a thin nozzle specially designed for squirting the graphite powder into the keyway.
https://www.youtube.com/watch?v=G11XUvtPWD8