Only one way out

You decide to crawl back in the vent
and further explore. While crawling, you notice the end of the vent is shaped like a slide. You lay on your back and slid on down, landing in a big ball pit.
You search the sides, but there seems to be now way out. "HMMM, you think to yourself, maybe there is a door at the bottom of the pit. Taking off your shoes, you feel around with your feet.