Tribologist here, about to publish a study of reciprocating friction and wear in graphene-loaded plastic composites. We see two orders of magnitude wear reductions at 30,000 cycles for 10% graphene by mass (dry reciprocating conditions) and suppression of the abrasive wear mode. Also friction coefficient goes down by 10%, but other studies have reported much bigger friction coefficient improvements.
Scribble a pencil on a piece of paper for a while, fold it in half, blow the dust into the lock and run the key in and out a few times. Works like a charm.
Teflon is actually completely inert in your body. It's only a problem if it is heated to the point of giving out fumes at 260 celsius, and I hope that isn't happening in the bedroom...