How about a gentle, relatively quiet but discouraging audio tone that activates when the swinging door opens?
Something like "uh uh", "uh oh", or "wah wah ~waaaah~" that is audible within, say, a x=20 foot radius. Maybe triggered only on subsequent usage within a y=10 minute window.
One might argue it discriminates against the handicapped, or causes them unnecessary discomfort. I would draw an analogy to seatbelt reminder tones in cars. They cause unnecessary discomfort to everybody but are so mild as to be worth it, overall.
Something like "uh uh", "uh oh", or "wah wah ~waaaah~" that is audible within, say, a x=20 foot radius. Maybe triggered only on subsequent usage within a y=10 minute window.
One might argue it discriminates against the handicapped, or causes them unnecessary discomfort. I would draw an analogy to seatbelt reminder tones in cars. They cause unnecessary discomfort to everybody but are so mild as to be worth it, overall.