Any license issued under this act may be suspended or revoked, after due notice and public hearing, if the licensee:
Any license issued under this act shall be revoked, after due notice and hearing thereon, if it shall be proved at the hearing that the licensee sold any handgun to a minor.
Said hearing herein provided shall be held within thirty (30) days after notice thereof, and the alleged violation determined by written order of the city or county issuing the license within sixty (60) days after such hearing is concluded; but no revocation or suspension or surrender of any license shall impair or affect the obligation of any preexisting lawful contract between the licensee and any borrower.
K.S.A. 16-713