Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Did not work in the classroom.

I needed an affordable and efficient pencil sharpener for my classroom. It sharpened some pencils, but others on only one side. It started getting louder after only a week. 20 minutes fter sharpening 21 pencils in a row, it randomly turned on and would not shut off without unplugging it. Now even if plugged in, it won't stop running and doesn't sharpen any pencils. Only lasted 4 weeks and sharpened less than 100 pencils.