Evil spirits hate the sound of crunching. Maybe it reminds them of their own bones? Not sure. But grab an apple, a carrot, or a bag of chips (I’m not judging) and eat loudly.
Chew with your mouth open if you’re brave enough. The spirit will cringe and think, “I’m out—this vessel has no manners.”
Warning: your roommate or cat might also vacate the area. That’s a small price to pay for spiritual freedom.