The doors symbolizes the ways we chose to go. If you are going through the door, then such dream represents the different stages of your minds where we go from one, to another. If the doors we dream of are being locked or just simply closed, then it shows the barriers we are going to face, or it is not the right time to go through that door. When you see more than one door, then it shows the opportunities we have.
Read more about dreaming of Door in other dream meanings interpretations.