Judges have what most people would consider insane levels of legitimate power while sitting on the bench itself inside the courtroom. Just outside the door, tho

Judges have what most people would consider insane levels of legitimate power while sitting on the bench itself inside the courtroom. Just outside the door, those powers are not quite so intense, but he can have you thrown in a cage just for not doing what he says, and he can command nearly anything. He could certainly demand that someone not leave the courtroom if he felt like doing so, and there would be no real remedy even if he did so for illegitimate reasons. Perhaps a censure months later.