Hello,
I remember seeing a film around 1995. It was a kid’s film with a mix of fantasy but in a modern setting. The children had an older guy with them as a sort of guide. They ended up going in a lift up to the baddy’s hideout, and the lift’s floor fell out. They children fell down, but the older guy remained where he was standing, because he was able to keep believing the floor was there.
Do you remember it?!
Based upon a similar movie being asked about at StackExchange, I’m going to suggest “Crossworlds”. 🙂