Of all the can wrenches I've found I think 2 had the triangle head on one side. I've never seen that bit used except on strange "padlocks". As for the keyway it looks like a cheap ol KW1 or a Yale would bump that. Otherwise just pry it open or rip the cylinder out with a slide hammer. Do take pictures, I'm curious about the insides. Needlenose pliers should work on the triangle lock.