Any person, firm or corporation that shall neglect or refuse to attend and testify or to answer any lawful inquiry or to produce documentary evidence, if in his or its power to do so, in obedience to the subpoena or lawful requirement of the commissioner shall be guilty of an offense and, upon conviction thereof by a court of competent jurisdiction, shall be punished by a fine of not more than $5,000.00 or by imprisonment for not more than one year or both.