Not exactly, but your employer can fire you if you don't, or for no reason, with no notice, if you're at "at will" employee without an employment contract or a union. And you're free to quit the same way.
Making you improve your mind is definitely not the worst thing an employer can make you do...
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.
