Door Dash is a very simple round in Fall Guys. All you need to do is reach the finish line by busting down the right doors. However, there's no telling which ones will break and which ones won't. The best way to play Door Dash is actually to hang back slightly and let others do most of the leg work.
However, you don't want to get too far behind, as you can easily get caught up in a stampede of players all trying to squeeze through one threshold. If you start out in the first row, you may as well go for it and try a door or two. Most of the doors in the first few sets will break. Just keep an eye on your competitors as they may forge a path you can follow.