Oh, forget the outlet and build a little home around the hole in the wall for the hamster, LOL!

My own experience with poison is just awful. Once those little guys get into the poison, who's to say where they will go to die? I had a mouse die inside one of my couches 30 years ago after using one of those poisons. I couldn't get at it. Wasn't long before that started to (EWW) really stink. Or do they make poison now that the little beasts just roll over and die immediately?

I'd live trap 'em and take 'em back to the pet store.