1> At 11:49, flight attendant Andreas Prodromou entered the cockpit and sat down in the captain's seat, having remained conscious by using a portable oxygen supply.
Yes, however it's not clear how they entered and why it took them so long (they entered a few minutes before the plane crashed due to fuel exhaustion -- the left engine shut down 50 seconds after he was seen entering the cockpit). It stands to reason that if the door was unlocked they may have been able to enter much earlier, which could've resulted in a very different outcome.
That's why I said "If the CA had entered earlier".
