In my day (ca. 2000) there was no "forced to give an F" and in fact it was very common for exam-takers to draw a line, write "everything below this line I did after the time limit", and get partial credit for it.
Not that I recall. I don't think it's quite fair to do that, as it then becomes an infinite time exam.
But also consider that the midterm and the final were the entire grade. No credit was given for homework, showing up for class, etc. The rules about the exams were pretty clear.
However, if you had a borderline exam grade, but had done the homework diligently, the prof would use that as a tie breaker.
His fellow students thought the F was a bit harsh, but he conceded that it was fair and took his lumps with equanimity. I quite admired him for it. In the end, it didn't hurt him because he graduated and went on to a very successful career.
