Wow, what a novel concept...
Anyhoo, Commoner (That makes me feel mean. Yes, commoner, I will deign to answer your query), have you been in all the labs? Not being able to open any other doors implies you haven't been in all the labs. And if you haven't been in all the labs, you couldn't have read all the clues, and you wouldn't be able to solve the floor. Go back and look for doors you might have missed (there are four labs), and check containers for keys you may have missed. If all else fails, press the Tab key to look for doors and containers if you can't see all too well.
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