A doorway is basically a symbol of progress and opportunity. It presents itself as an opportunity for you to walk through it, to progress forward from one space to the next. Can you see the opportunities presented to you everyday or are you blind to the doorways in your life?
You are free to create and discover your own doorways. You can literally do anything you want you just have to take action. In other words realize the opportunity and go through the doorway! You never know what’s on the other side unless you go. So go, see for yourself. You will never progress by staying in the same space.