N.J. Stat. § 3B:2-8
Any person subpoenaed as a witness by a surrogate, who does not appear pursuant thereto, or appearing refuses to be sworn or give evidence, without reasonable cause assigned, shall, for every such default or refusal, be subject to a fine of not more than $50.00, as the surrogate's court issuing the subpoena shall by judgment determine proper to impose. The fine, when collected, shall be paid to the county.
In default of the payment of a fine so imposed, the surrogate's court by its judgment may commit the witness to the county jail of the county until it is paid or he is sooner discharged.
The judgment of the surrogate's court imposing a fine or committing a witness to jail shall be reviewable by the Superior Court in the same manner as other judgments of the court are reviewed.
N.J.S. § 3B:2-8