I don't know if it gets me "unstuck" per se, but I'll second the notion of cleaning or doing other menial, "mindless" tasks in really pretty much any situation where you struggle with mental work. Not just if stuck, but if just tired and sluggish etc. as well.

A bonus for me at least is that when I'm too mentally tired to focus effectively enough on work or mentally taxing hobbies, my mind is also far less likely to rebel against the idea of doing house work...