If any person shall refuse to appear before the motor vehicles commissioner when required to do so, as aforesaid, or shall refuse to testify before the motor vehicles commissioner in regard to any matter as to which the motor vehicles commissioner may require him to testify, or if any person shall refuse to produce any paper in his possession or under his control, which the motor vehicles commissioner may require him to produce, every such person shall be guilty of a misdemeanor and, fined $500, and may be imprisoned not less than one nor more than six months, at the discretion of the court.