⭐ Merited by vapourminer (1)
It's a bit light for an anchor and you need to hammer it really good before so 
Doorstopper would fit better, they can do exactly that, I have used them for such purpose when i had nobody to hold the door while i carry stuff inside/,outside.
I think the scrap value for S9 was 10-15% in China 2-3 years ago, now with all metals increasing cost, it should be 20$ or so, so ya, worst case.