How to restore crumpled paperbacks?

I accidentally crushed a paperback book by putting my laptop in my backpack on top of it, and now the back cover is crumpled and folded.

What's the best way to restore the book quickly and effectively, if such a way exists?

~ I've tried the usual method of placing the book on a flat surface under a ton of weight overnight, but the folds still persist. What can I do?

I've ironed paper before, with an electric iron on low heat. It works pretty well. But without seeing a photo of your book, I'm not sure how well that would work or if it would cause any damage.