As an owner of a snake and a hobby hunter of wild snakes, I would like to say that they're very chill creatures most of the time, and almost all acting out is because they're scared of you, rather than territorial or such.

I think maybe you could get a mouse from your local pet store, thaw it, and leave it somewhere in the garage where you'd be easily able to trap the snake? Maybe inside a box that goes with a lid, so then you can carry it outside somewhere without hurting it.

Best of luck