Looking for the name or plot to a movie. All I remember is that athe dad paints a door on the floor or maybe a wall. They open it and go through it.

The name of the film is "Lucie a zázraky", called "Lucy and the Miracles" on the CCFF. Here is a clip, the part you remember is at the 3:15 mark:

https://www.youtube.com/watch?v=2gqvFJbA6VQ