We had a problem a couple of months ago, in our garage. I bought the non-lethal traps at Wal-Mart, about $1.50 each. They are a plastic cube with a swing door that once the little critter goes in it can't push the door the other way to get out. We put a little cracker with peanut butter in the far end and it worked great! Then made my husband relocate them in the country a few miles from our house so they couldn't find their way back "home". Ok, I can't kill them -and at least my DH told me he relocated them . . .
Now I leave one of these traps out there so if they ever try again . . .
Good luck.