When one door closes, not always does another one open. Maybe none of them will open (always read the signs. It could be a push not pull door, or vice versa). Maybe none of them will open because they are all jammed. That is when you make a hole in the wall beside those doors. Then you squeeze your way through the wall and into the next room. Don't think of the splinters, sweat, or blood as you do it. Focus on where you want to be.
Often you have to work hard to get somewhere. You will appreciate the outcome more if you work hard. No matter what the outcome is. Because in hindsight, the most appreciated and best part of working hard is not entirely the results. But rather, the journey and process that took place in order for you to get where you really wanted to be. In my experience, I find myself admiring the time and effort that I put into something more than the outcome itself. And I believe that you can see it the same way that I do. It most definitely takes time to change the way you see things, but I think it is worth it.
So don't be surprised if none of the doors open (also...never jump out of a window. Only if there are fires on the other side of those doors. There are exceptions to everything). Take it as a challenge. Doors not opening isn't necessarily a bad thing. I mean, let's be honest here. Doors don't just conveniently open by themselves. Unless there is someone on the other side helping you out, (which is okay every so often), or the place is haunted.