Instruct: Classify a given review as either positive or negative.
Query: Right now I am in my room...

and my bike is at class. I spent 10 minutes fiddling with it, and could not get it open. The key turns the lock, but its stuck good. It often didn't open on the first try, but now it's completely stuck. I will try another key, but I'm not happy now, after having to walk back.edit: I found that knocking on the side of the lock barrel helps the most, as well as rapidly turning the key. Pulling on the U is useless. I added some oil (low temperature engine oil), and it seems to be much better. I think it is worst in below-freezing temperatures. It is better than it was, but DO NOT RECOMMEND. If you haven't bought it yet, buy a different lock.