Keys, or Animal-Headed Men

Dusk. The lights from the carnival reflect off the windows of Wilshire Tower. It stands, glowing with the delighted fire of those lights, monumental and lonely against the fading sun. I see something small and metal on the sidewalk outside of the apartment building. A key. I pocket it.
A memory:
I was wandering the halls of the new institution they had me in. This was after the hospital, of course. They had me at this new place. It wasn't quite a mental house but it wasn't the most comfortable place either. I wasn't told where I was or how long I would be there or why they had me locked up. They never told me what all the experiments and tests were for either. Anyway, I was wandering the halls, and turned a corner and there was this red door. I figured it had to be important, so I went in. The door led to a hallway that receded into darkness. There were no overhead lights. I walked forward, groping the walls. I guess I got scared or something, so I ran back toward the door before I went too far. There was something ominous about that darkness.
The door was, of course, locked. I banged on it for what felt like hours, screaming until my voice went hoarse. Eventually I felt that familiar pain in my head and then a pop. I passed out in exhaustion.
I remember waking up hot and sweaty, unable to breathe. Something was pressing down on my chest. Forcing myself up, I heard the pile of keys that had been covering me fall to the ground, clinking. The light from under the door made them glint in the darkness. I was surrounded by them. Keys of every make and color. I immediately knew that none of them would fit into the lock on the red door. That just wasn't how these things worked. I sighed, and leaned back on the pile of keys, resigned to my fate. Thousands of keys and one lock. You'd think the odds were in my favor. But at this point I knew better.
The noise of the carnival brought me back to reality.
I was getting close. There were people in the streets. We walked as one, past the closed storefronts and the run-down alleyways toward that promising glow. I passed on front of one alleyway and stopped. I could see, barely, down the alley, a man holding a baseball bat, silently pursuing an oblivious young girl. What struck me was his head. It wasn't human. He had an animal head, just like in my dream. I've never been one to follow 'signs' or 'omens' but I'm not exactly in the best position to disregard events such as these either. Animal-headed men didn't strike me as odd, but this felt significant. I yelled something at him. I didn't know what else to do. He disappeared. I blinked, and stood in silence. Looking back at the carnival, I turned around and made my way home, lost in thought.
I think eventually I heard someone walk by on the other side of the red door. I don't know how else I would've escaped. I probably banged on the door as they walked by and they had a key and let me out. Then again, I'm not really sure. Was that animal-headed man real? Did he have something to do with my dream? Did I ever actually escape that hallway behind the red door?