That is actually a pretty good idea. I have a bunch laying around that we can bring. The downside to this and Gerry's solution is it doesn't matter when the door gets kicked in and flys off the hinges connected to the jam. If you just don't want the door to be unlocked and easily pushed open either solution will be fine. But don't think you are by any means fortifying the door.
Everyone always thinks the doors and the locks need to be fortified, but usually they are right next to a big glass window...