For the twenty-first of my 25 Undead Christmas presents I want a pack of TAC-Wedges.
They are lightweight, and will seal a door closed (or open) whenever you need to make sure that door is not going to move. But be warned, once in place, you can’t remove it without a sledge to shatter the actual device.
It has four steel teeth on the back end that will bite into concrete, marble, vinyl, and lock the door in place after you kick this thing home. After that, you either just sealed the door closed or made sure you have a path out. You can also set it into a door sideways between its hinges to make sure it stays open, and has the advantage of not sealing the door open permanently.
And they are relatively light weight, so you can keep a couple strapped to the back of your pack. You never know when your going to have to shut a door between you and an undead horde.
Just remember, the door isn’t going to be opened, but if there is enough weight behind the attack, the door frame might fail. The TAC-Wedge is only going to keep the door from opening, not turn an interior door into a steel plated vault door.