Wow, times must be tough for those northern critters ... can't say that I've heard of one trying to get into the house that way.
I've had to shoo them, and the occasional possum, and the neighbor's cat, away from the cat's food in our garage. Would that I had video of Mrs. medic8r stomping her feet on the driveway and taunting a possum never to come back here again!!!
Then there was the time, when I was 12 or so, that my Mom finally got fed up with opossums raiding our chicken house. One night when she heard the typical ruckus, she grabbed the shotgun and treed one. BLAM!!! She liked to brag that it rained possum for a week.
