Find where they’re coming in if you can. They can squeeze through very small openings, but usually you’ll see some scratches by a small opening. Get a tube of caulking and fill any of these holes. Then get some snap traps, as others have said. I like these ones: https://www.amazon.com/Indoor-Effective-Sanitary-Catcher-Family/dp/B083LDKS6Z/ . They’re reusable. Don’t bait them, just place them along walls where the mice may be hiding/running (basically in areas that you see mouse droppings). Mice will typically run along walls, not through open rooms, and they’ll walk right into the traps. When you catch one, you open the trap to throw the mouse in the trash, reset it, and repeat. Eventually, you’ll catch them all and won’t have any more mice. I do the same in my shed, but that’s an ongoing issue since it can’t be blocked off completely.

Also, a pest control company might help by helping you place traps and preventing them from getting inside. Good luck. It took me about a year to get rid of all the mice in my crawl space/basement.