80’s movie where kids break into a lab

Trying to remember a movie my babysitter showed me in the 80’s (?). In one of the final scenes, the kids are getting ready to break into a lab. They are supposed to be wearing disguises, and one of the kids puts on a superhero costume (his character reminds me of Chunk in The Goonies). They get past video cameras by putting a picture in front of it.

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