If any witness so attached shall show reasonable excuse for not appearing, as required by the subpoena, he shall be discharged, either with or without the payment of the costs of the attachment, at the discretion of the coroner, but if he fail to show any good and sufficient reason for not attending, he shall be fined in such sum as the coroner shall think reasonable to impose, not exceeding ten dollars, and may be committed to the city or county jail until such fine and costs are paid, in like manner as persons may be committed for the nonpayment of fine and costs in criminal cases, and any fine so imposed and collected shall be paid into the school fund of the county or city in which the coroner holds his position.