As long as you give them warning, they'll leave the area. You just don't want to surprise them. Banging around works. Check where you're going to reach with a flashlight and don't put your hands where you haven't checked!
Otherwise wait for the cold!!
I worry more about bee's than snakes. I hate being stung!
A long stick or pole, make all the racket you can, and it's still no gaurantee..
However, if you have some time, a place called Gemplers sells snake repellant,
it really works, sprinkle it around and in the car, next day and no snakes.
I don't know if I would wait, someone else might not. How about a some of those bug foggers, a couple of cans of Chem-tool, wasp spray, a hammer and a shot gun.
I actually took a harness out of a '70 Cuda in one of those backwoods wrecking yards. Long sleeve shirt and pants, duct tape the cuffs to prevent critters from the sneak attack. Of course, being younger then I didn't even think about snakes. Some of those Mechanix goves might help if you can narrow it down to just critters.
If you don't mind cleaning the stuff afterwards, when I was a kid I watched a friend's dad used a fire extinguisher (dry medium) to chase out some creepy crawlies from a tool shed. Made a huge mess but also a nice stampede of surviving critters.
use a CO2 fire extinguser and keep a spare one handy works good freezes the critters and crawlers just make sure you hit the crawlers with it, also works to chill a six pack (or so i have been told would not know myself ) CO2 will not leave a mess