Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Key broke off in the lock

The lock itself served its purpose, but the key design is terrible. Not only is it hard to fit in the lock to where you practically have to force it in, it's so poorly made that it can actually rip in half. So thanks, Bell, for that second key. I guess you knew we'd need it eventually. What happens when that one breaks too? Don't buy this product.