https://www.foxnews.com/opinion/andrew-mccarthy-congress-contempt-barr-democrats-watergate
When Congress uses its contempt power, there are basically three avenues it can pursue for purposes of enforcement. In the case of the House Judiciary Committee’s party-line vote to hold Attorney General William Barr in contempt – for purportedly failing to produce a report he has actually produced – Democrats, who control the House, will use the route that is most political and, thus, least credible: the unilateral congressional procedure.
The committee will refer its finding for a vote by the full chamber. The stunt here is so nakedly partisan that the House won’t even try to get support from the Senate. In theory, the House could try to take enforcement action on contempt. Congress even has a jail cell in the bowels of the Capitol … though it hasn’t been used in many, many years, and it certainly is not going to be used against a cabinet officer of the executive branch. (I’m thinking the U.S. marshals would not take kindly to the House sergeant-at-arms showing up at Main Justice with a congressional arrest warrant for the attorney general).
On the other extreme, the House could theoretically avail itself of the second avenue: It could seek the help of the executive branch – specifically, the Justice Department – to pursue criminal contempt charges against the attorney general (i.e., it could ask the attorney general to prosecute the attorney general).