That was the one I was just about to post. Scared the living crud out of me when I was about 6 or 7 years old. And that ending!
That makes 3 of us for “Invaders From Mars”. I saw it again a few years ago and realized I had remembered several things wrong tho only slightly.
It really impressed me. The second time I saw it was a bit of a disappointment, mainly because I had built it up in my mind as so awesome, but the third time it was better as I just sat back and enjoyed it.
You and I must be the same age ... I came home and kept checking my parent’s necks for weeks after that. My two older brothers took me to the movie ‘cause they couldn’t go unless they took their little brother along’. Parents thought they were going to an Abbott and Costello movie!