Locked in the Locker

Walking through the hallways at the middle school where I work, I saw a new substitute teacher standing outside his classroom with his forehead against a locker.
I heard him mutter, "How did you get yourself into this?"

Knowing he was assigned to a difficult class, I tried to offer moral support. "Are you okay?" I asked. "Can I help?"

He lifted his head and replied, "I’ll be fine as soon as I get this kid out of his locker."