The court of common pleas shall, on application of the district board, enforce by proper proceedings the attendance and testimony of witnesses and the production and examination of books, papers and records and shall have the power to punish as for contempt of court, by a fine or imprisonment or both, the unexcused failure or refusal to attend and give testimony or produce books, papers and records as may have been required in any subpoena issued by the district board. The district board may issue to the sheriff of the county in which any hearing is held a warrant requiring him to produce at the hearing any witness who shall have ignored or failed to comply with any subpoena issued by the district board and duly served upon such witness. Such a warrant shall authorize the sheriff to arrest and produce at the hearing such witness, and it shall be his duty to do so; but the failure of a witness so to appear in response to any such subpoena may be excused on the same grounds as provided by law in the courts of this State as to the attendance of witnesses and jurors.