The question was how to shut off the engine.

Anyway, it's probably better left running while you call a locksmith (if you don't have a coat hanger or a slim-jim) unless the truck's in an enclosed space and a child is inside the truck, because (as you say) the coil is still energized - not a good thing and a great way to burn up a coil or other ignition components.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum