What is the ruling on a husband threatening his wife with divorce if she goes to her job, with his intention being for her to take a break to rest and then return to her job?

This phrasing (If you go to school, I will divorce you) has no consequences, as it is a promise of divorce that is not binding unless the husband carries it out, whether the wife goes to school or not. The husband should not resort to swearing by divorce in the future.