A few years ago we had a new immigrant pastor at one of our local houses of worship. He had a groundhog destroying his garden at the parish house. One of the parishioners advised him to pour gasoline in its hole and light it. That’s when he discovers me groundhog has a back door hole in the garage.
Snakes ban be nearly impossible to eradicate once established in the walls and ceilings of a house. I think they are usually phase 2 of a rodent problem.