Know the laws for your state. Most of the states in the union are fucked, but some at least have something on the books.
https://www.patriotsoftware.com/blog/payroll/state-mandated-paid-sick-leave-laws/
Also, remember that paid sick leave is different from paid vacation. In many states, unused paid vacation must be paid upon termination, many times regardless of the reason for the termination. Unfortunately, my state is absolute trash and does not provide any protections for workers' rights or hold employers accountable for a damn thing. Hope this helps someone else though.
https://ask.legalsolutions.thomsonreuters.info/cc-nto-vacation-rolling-pl