That happened to me Easter weekend! I had pressure washed my patio the night before and upset the snakes living under my patio that I didn't know lived under my patio. My husband had taken his college golf team on a tournament, so I was all by myself. Well, I had my two dogs, but they would jump up on the couch when they saw a snake so a lot of help they were!
For 3 days, they slithered in and caused me a lot of grief. I killed them with wasp spray and a broom. What amazed me was how small a space they could slither through.
It turned out they were called rough earth snakes and totally harmless, but that didn't matter to me. A snake is a snake.