It is unlawful for any person, while operating or in charge of a vehicle, to park or willfully allow such vehicle to stand upon a public highway or in a public place with its motor running, leaving a minor child or children under the age of sixteen years unattended in the vehicle.
Any person violating the provisions of this section is guilty of a misdemeanor. Upon a subsequent conviction for a violation of this section, the department shall revoke the operator's license of such person.