No employer shall discharge or terminate, or threaten to discharge or terminate, from his or her employment, or otherwise punish or penalize his or her employee who is a witness to a crime, because of time lost from regular employment resulting from his or her attendance at a proceeding under subpoena issued in any criminal proceeding relative to the crime. An employer who knowingly or intentionally violates this Section shall be proceeded against and punished for contempt of court. This Section shall not be construed as requiring an employer to pay an employee for time lost resulting from attendance at any proceeding.