All barber shops and barber schools shall be inspected regarding their sanitary condition by the Department of Public Health whenever the department deems it necessary, and any authorized representative of the department shall have full power to enter and inspect any such shop or school during usual business hours. If any barber shop or barber school, upon such inspection, is found to be in an unsanitary condition, the commissioner or the commissioner’s designee shall make written order that such shop or school be placed in a sanitary condition. All barber shops and barber schools shall post in a conspicuous place the license of any person who engages in the practice of barbering in such shop or school. A director of health for any town, city, borough or district department of health, authorized by the department to enter and inspect barber shops and barber schools, in accordance with the provisions of this section, may assess a civil penalty in accordance with the provisions of section 20-249 against any person owning a barber shop or barber school that fails to post the licenses of persons engaged in the practice of barbering as prescribed in this section.