I was born in 81 and I saw this film as a kid as a video rental. It had a modern family but they went on some sort of magical adventure. I remember several key things that would identify it. There was a focus on a mailbox or something in the mailbox that caused magical things. There was a desert with bones in it. There was a glass wall, like an invisible wall. I’ve already done a lot of web searches, it’s probably not an obvious or common movie.