If a juror duly summoned neglects or refuses to appear in obedience to a venire issued by a magistrates court and does not render within forty-eight hours to the summoning magistrate a sufficient reason for his delinquency, he must pay a civil penalty not exceeding one hundred dollars. A failure to pay the civil penalty assessed is a contempt of court and may be punished accordingly. A person shall not serve on a jury in a magistrates court more than once every calendar year.