I rarely close my office door, but when I do, it is usually for a reason (I am busy or stressed or need to focus, and closed off environment helps me do just that).
There is a coworker who consistently (2nd time so far) completely ignores what I thought was a universal sign for do not disturb (my closed door) and either knocks on it to wave "Hello", or just plain opens it and starts talking BS and chit chat asking me what I am doing/working on. To add insult to injury later he props it open with a door stopper and continues on chit chatting...
I suppose I am (have been) willing to allow this to happen rather than saying "Ya know, kind sir, I am in the middle of something, let me get back to you later", but not really as it bugged me enough to write this post. Perhaps next time I can find a way to deal with it better than come here to effectively complain.
Being an extra nice person (to my detriment) I ... allowed it to happen so far. Not sure why or what I was thinking, but I much prefer that if my door is opened by someone else, that it is my direct boss or any higher boss, or that it is a production emergency, or building is on fire but alarm didn't go off.
There are of course also levels of DND signal. I can be in "omg totally do not bother me" mode, where I will forcefully eject unwelcome intruders into my office quite forcefully, if I have to, but I can be more so in "I want some peace and quiet with no specific burning reason", to where some interruption may be more tolerable, but still undesirable.
I do have a lock on my door that I have not used so far.
The coworker in question is Japanese, so maybe there are some culture differences, but I am located in United States.
How do I deal with this while being business-appropriate? I want my closed door to mean "do not disturb me, period, unless something is on fire, or you are my direct boss (whom I'll forgive such interruption)".
If I am wrong to expect such privacy, please let me know as well.