It is unlawful for a licensee to sell beer or wine at wholesale or retail, to sell or offer to sell beer or wine after the license has been revoked or canceled, or during the period of a suspension of the license. A person who violates this section is guilty of a misdemeanor and, upon conviction, must be fined not less than twenty dollars nor more than one hundred dollars or imprisoned for not less than ten days nor more than thirty days, or both, in the discretion of the court.