GrynchGaming,
I'm unsure on what you tried, but if you go up to the clock after you have read the note, then press the right mouse button you'll zoom in and focus. Use this zoom in feature on the clock in the lobby to trigger the event that unlocks the door in the middle of the room. The note is a puzzle saying pay attention to the time and the player must focus on the time to trigger the event. I will say though, that this is the end of the demo when you get to that point. An update is coming though where the demo will be extended with more puzzles :)
Thank you,
David Clark (Promnesia Developer)