They never worked for me either, until I came to the realization that there is no such thing as a writer's block.
It is called procrastination. It is also called getting "stuck" on a storyline or just not working out in your head - what is to unfold, onto text.
One thing that worked for me when I got stuck - was to switch to first person and "act" like my character. I hate first person narrative but pretending to be the character and writing as him/her has helped me overcome some hurdles.