Eliminate the reason they are coming into your garage...
Food scraps?
Warm place to bed down?
Then...PB on the paddle, set and wait...
S N A P !
Little buggar's neck is in two pieces and he never felt it...
Open the hasp...dump the body, rebait w/fresh PB, and wait for another snap...
BTW, after about 2 or 3 snaps, throw out the trap...the little guys seem to sense "death" and will avoid the trap, regardless what you're using for bait...
Good luck!