How would they be selected? Would it work like extended jury duty? Also, how will the salary difference be made up? If I'm making just enough to pay for my foo

How would they be selected? Would it work like extended jury duty? Also, how will the salary difference be made up? If I'm making just enough to pay for my food & rent/mortgage, and suddenly I'm working on a public teacher salary for a year, what happens to my house and family when suddenly my salary is cut by anywhere from 50 to 90%?