Earlier quoted context omitted.
At CES a Ford EV on display had this printed on its window "Doors are locked for your protection". Instead of being honest and saying "it's an early prototype"
Not to get side tracked with galling examples of Corp speak but a grocery store in Seattle has these signs that read,”please allow us to help you at another register” where it used to say “lane closed” or simply “closed”.
You could even imagine a case where the lane was closed to customers but perhaps in use for a training. This sign would avoid confusion, whereas a ‘closed’ sign would invite answers.