When I had the locksmith come to make me a key for the deadlbolt installed in the handle, he was enthused about the lock. He said that Schlages of the era (1979) were some of the best locks, in his opinion, ever made, and that he could not pick it. That might be hyperbole, but he took the removed cylinder back to his truck and worked on it for thirty minutes before he produced a key.
One these is with the truck key somewhere on my truck.
1975 Argosy 28 "Argosy"
1979 Excella 500 31 "Betsy"
1992 Lincoln Mk 7 LSC
2003 Dodge 2500 Cummins "TowHog"
"Lucy Loosehair" the cat - Airstream mascot
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