A sign works I guess.
Between my studio, and the rest of the house is a nasty shaped bathroom with a slanted ceiling, that I have to kinda duck a bit to get through. On the other side of that bathroom, is my wife's office, which is the 4th bedroom of the house. I installed above that door a homemade "recording" light, which I can turn on and off with a switch in my switch panel in the studio wall. It's a small "exit" sign I modified, nothing fancy.
Also, the door between her office/bedroom and that bathroom, has an electronic striker plate. If I energize the striker plate (from the same switch the recording light is on), you cannot open the door from the inside, or the outside without an axe.
Drastic measures, but dispite my saying while I'm walking into my studio "I'm recording now, please leave me alone for a few hours" reality is my lovely wife must come bother me and tell me about how cute her asian leopard is, or how a friend called and had a computer question, etc.
So, when I'm in here, and actually recording, I play prison and flip the switch.
So far it has worked well. Saved me the trouble of attaching a high voltage, low current transformer to the door knob.
