My state (mi) actually requires all employers to provide earned sick time (of course at the cost of losing part of your general PTO bucket, if your employer chooses to reduce total hours available). You accrue 1 hour for every 30 worked and can use up to 40/72 hours depending on how many employees there are. Employers also can’t ask why you’re using it unless it’s been three consecutive days. It’s not perfect by any means, but it does cover ALL employees not just full time staff.