Mine are kept where chickens can't go, coop only takes up half the shed.Snap Traps have two draw backs. Chickens can get stuck in one. And I have ants that eat all the p-nut butter.
I use a bit of scratch grain as bait, with one sunflower seed crammed into trigger.
Much 'cleaner' than messing with PB, and that one stuck seed can't be licked off.