Workflows Stuck in Scheduled status

Yesterday we had quite a few workflows showing as failed, checking the logs, I found that our AD workflow account had locked out. I unlocked the account, and new workflows have been running fine, I clicked 'retry' on the failed workflows, but since then they have been stuck in 'Scheduled' status.
What is the best way to force these scheduled workflows to run?
Answers
Opening up the Related Item on a workflow sheds some light on this in most cases.