Instruct: Classify a given review into positive or negative sentiment.
Query: Sliding door locks

This is the first product review I have written, but I really felt I needed to let people know about this product. DO NOT buy this product unless you intend to modify it and screw it in the wall. My attempts at installing it normally failed when it fell off with the slightest nudge. I really needed it to work, so I drilled a hole in it and installed it to the wall with a screw. With that modification, the product works well and is very sturdy.