The poem starts out like a bad day with unruly kids or a chaotic crowd. The speaker is "in charge," but nobody listens, nobody stops, and the damage keeps piling up. Shouting doesn't work, bribes don't work, and being ignored turns into being made worse by the very attempt to take control. The short, flat lines make each failure feel like another door closing.
The last line changes everything. The speaker isn't simply a frustrated supervisor but someone rocking in a corner of a padded room in a mental hospital. That twist makes us wonder how much of the chaos was real and how much was in the speaker's mind. Judging by the title, "No One There," the unruly crowd may not exist at all. The mood is one of helplessness, panic, and isolation. The use of "you" pulls the reader into that powerlessness, so the ending feels less like an observation and more like something that could happen to us.