Vague memory of weird (low-budget?) movie circa 1980s involving kidnapping and some amount of magic.

An 8-y.o. boy, ma Asian, gets kidnapped in a big white van, and driven to some abandoned warehouse. I think maybe other kids were getting kidnapped and kept there too. He finally gets the chance to escape: there are hundreds of invisible wires strung across the floor/from the walls and he uses a baton with streamers on it to see the wires and step over them. At the end there was this big, white movie-screen-like wall that paints itself in with a floating paintbrush; glittery 80's special effects included. Would be MOST grateful to relive this distant, random memory from my childhood. Thanks!

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