That’s certainly a losing strategy. Ginning up a confrontation over an issue for which you have little popular support, and are backed by losing legal argument just seems like a way to get clobbered.
If Legislative branch staffers attempt to restrain the Attorney General, he will simply order Federal marshals to arrest them. I doubt the House Sergeant at Arms and other House security personnel are going to want do anything to get themselves taken into custody. They are not going to go toe-to-toe with Federal agents from the DOJ.
Trying to restrain the AG will quickly lead to legal action in the Supreme Court. It will likely issue an immediate injunction against Congress. It might be 9-0, but it will be at least 5-4. A Legislative attempt to restrain an Executive Branch official has no precedent and is nowhere authorized in the Constitution. The only Constitutional option against Barr is impeachment and conviction . But until that happens, he cannot be detained for violating a House subpoena. No matter how much you wish it otherwise, the Legislature has no Constitutional power to detain Executive branch officials.
Also this type of House action will be incredibly unpopular. A large majority of the country will oppose it and see the Democrats as at fault. Republicans will successfully paint the Democrats as power hungry lunatics who precipitated a confrontation for no good reason.
Further, it would alienate the whole moderate wing of the party. Democrats who got elected from suburban and Midwestern swing districts will defect and vote with Republicans to quash the subpoena.
Have you really thought through how bad the Democrats who pursue this idea will look after they are utterly defeated? Really it has no realistic chance of success. It will unite all Republicans, all Independents, and most moderate Democrats in opposition. Take off your hyper-partisan glasses. The Democrats have lost support because they made a big bet on endless dubious investigations and scheming illegitimate tricks to overturn the 2016 election. You want to go all in on a losing hand. Bad idea.