I've read the reviews and the videos from ThePointsGuy and Sam Chui, but I can't seem to find this information. Anybody know if the doors on the new enclosed suites can be locked? Or there's some sort of "Do not disturb" light outside the doors?

If I'm sleeping inside I don't want the flight attendants to be knocking the door asking me if I want a towel or drinks (Unless it's during takeoff and landing when they have to do this for safety).

Thanks.