Revolving Doors

Revolving doors.
Sometimes they let people in
sometimes they shut people out.
They may let in people that belong outside;
or shut out people that should be inside.
But doors are just doors, right?
They don't know any better.
They just spin,and spin, until it's time to close up.
Sometimes they stay closed for months at a time.
Sometimes hours stretch to overtime, day to day.
Open and close, open and close;
until the revolving doors can't turn anymore.
Then whoever is inside, is inside; whoever isn't...
will forever be outside
looking in.