To dream of a barber shop represents your wish to change your mindset or attitude. Wanting to be set straight whether it feels good or not. Wanting to feel better or be rid of negativity on your mind. Being ready for change and to move in a different direction.
Positively, a barber shop may represent wanting someone else to guide you when you're lost, give you insight into a problem, or give you an answer to something that puzzles you.
Example: A man dreamed of walking into a barber shop to find out that his sister's boyfriend wasn't there. In waking life heard his sister crying and in his attempt to get her to stop found out that her boyfriend was murdered. The barber shop reflected his dislike with thinking of his sister crying and wanted to change it by asking her what was wrong.