Check whether your snap button is active or not in your Graph Editor. It will have a Magnet icon and also try to snap in Graph Editor.
Also try to zoom in in time line because if you are trying to snap in full zoom out, it will not snap properly
Hope this will work.
I am a keen learner and am very keen on pursuing a career in the animation industry. My artistic skills are mostly self-
taught. I have a deep knowledge base of Photoshop, Maya, Adobe Premiere, After Effects, Final Cut Pro and Sony Vegas.