Snap trap with a metal bait pedal. Sew a small piece of raw bacon onto the pedal with needle and thread. Smear with a little peanut butter. Sit back and watch the action. You likely won't have to re-bait for quite some time.

Learned that one from my grandfather. They attempt to bite the bait and their teeth get caught in the chewy bacon and thread and WHAM! Shake out the deceased and re-set against a wall.

I've also had good luck with a small piece of cheese lightly pressed onto the pedal and tied with fishing line barely cutting into the cheese. Same concept when they get their teeth over a piece of the line. Even the dried out cheese continues to work.