Wait. Wait. I know I said push stuff, but let me think out loud here. Red's too obvious. Everyone thinks of pushing the red button. Green's too obvious, because that always means go. So if there's like a blue one...maybe that's it.

[So time to press the first blue 'lock' button that she saw, then. She just hoped that when she reached her hand out and pressed it that it wouldn't suddenly trap them all in there, or drop the floor out from under them, or anything like that.]