The least you could’ve done to not plagiarize was read the review and use the ideas they mentioned to motivate your own thinking. It’s a film review, so it’s not like you would be pressed with time for reading a book. You could’ve spent 2 hours watching the movie, 15 minutes or so reading reviews and drafting possible critiques and arguments, and then banged out the essay in less than an hour. No guilt, no anxiety, no 0.
That being said, you learned your lesson with minimum consequences. You’re lucky you only got a 0 on the assignment. In college you could be expelled.
Next time, be honest upfront. In fact, don’t plagiarize at all!