I would think you would need a professional pest control person for this. You obviously have an entrance somewhere. They are probably jumping from a nearby tree branch to get in.
Some squirrels got in the attic portion of the pole barn a few years back. They're ruining some of the insulation in the walls. I have some balance issues and don't...
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https://www.thespruce.com/get-squirrels-out-of-the-attic-2656730
I would think you would need a professional pest control person for this. You obviously have an entrance somewhere. They are probably jumping from a nearby tree branch to get in.