Needing to use the restroom is a symbol that you feel there is something in your life that you feel the need to be rid of.
Co-workers standing in your way symbolize the possible emotional barriers you feel are keeping you from letting go of the painful memories.
But the fact that you don't let the poster, 'phase' you, while on your way to use the restroom, is your subconscious telling you not to make the mistake of going back.
Not to 'fall for it again'....that you feel you've been hurt enough.

So yes, I think you're subconscious is telling you it's time to go on with your life.

Hope that helps, and best wishes!