Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Didn't work as planned

I bought this lock because my dogs discovered they could worm their way out of the gate and run into the street (when i just had the GT500 opener). I thought this would be perfect to lock the gate in place with no chance of their escape. What I found was after hours of adjustments, it would not time itself correctly to lock when shut and to release when opened. It would try to open even though the latch was still locked (latch would open and close back before the gate would start to open). I finally removed the lock when it malfunctioned so bad, it bent the arm of my GT500 opener. Luckily I bought the opener at a local store and they swapped it out for me. The new opener has worked fine since I took the lock off.