Any person who shall violate any of the provisions of this article, or who shall obstruct or hinder the commissioner or any officer or employee, in the performance of his duties under this article, shall be guilty of a misdemeanor, and, upon conviction thereof, shall, for the first offense, be fined not more than $100, and upon conviction for each subsequent offense be fined not more than $500, and in addition to such fine may be confined in the county jail for not more than ninety days.