If you’ve ever taken a lock apart to free up frozen tumblers, they have five or so round brass tumblers with springs that need to freely move up and down. I just have a hard time seeing how dry graphite will coat those tumblers in the cylinders, let alone prevent the oxidation that freezes up the tumblers. Maybe if you took them all apart and coated them first, but from my pinewood derby days, you had to mix the graphite with alcohol to be able to get the graphite to stick on the axle. Just spraying the dry lube on did no good. On one lock I tried to free up, I had to just plain eliminate one tumbler because it was so badly corroded. Just don’t see how spraying dry graphite in the lock would have prevented that.