As Techman wrote on the previous page;
"Sure dont want to be the pax, who in dire need of a leak, tries the wrong door."
Funny enough, that's actually happened with me a couple of months ago. No, the cockpit door was not locked. Usually any cabin crew that wishes to enter will give a 'knock knock' first. One day during the cruise we hear the door suddenly open. The Captain and I look back and are staring at this elderly gentleman who is giving us the same confused expression back. He says nothing and then retreats and closes the door!
The forward toilet is just outside the cockpit but he must have not been able to understand "Authorised Personnel Only" written in bold red with the No Entry sign on the cockpit door. The Leading Attendant must have been busy with meal service and not noticed him go for the wrong door.
