Does the “do not disturb” sign actually mean anything?

I don’t think I have ever not been disturbed after hanging that sign. Let’s say it’s the weekend so I hang the sign to try and sleep in a bit, I can guarantee that at about 10am the housekeeping will knock on the door and try to come in the room anyway.

Does the “do not disturb” sign actually mean anything?
Does the “do not disturb” sign actually mean anything?
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