The high school I attended in CT (Amity) had locked doors except the
main ones visible from the main office area. All the other doors and
ground floor windows were locked but it was to keep students *in* not to
keep outsiders from entering. I used to skip the last period study hall
all the time to go to work at the garage I worked at after school. I
didn't try to escape from windows or locked doors. I just walked past
the main office with my books under my arm, waved at the office people
and walked out the door. It's amazing what you can do if you act like
you are supposed to be doing what you are doing. No one ever challenged me.
I was never in a school with locked doors but that was a different
time. My high school was in a building open to the public in the 1700
block of G street NW DC. We had a number of ways to get in and out
either to G street or the alley in back.
Guess it depends where you lived. We aren't that different in ages I
don't think.