Line Renderer Keys don't work

Hi, I am creating a game and I am using a line renderer for a laser. I want the laser to bulb out in the front, then go back to its normal width. I tried to add keys in the AnimationCurve but it didn’t seem to change anything. The only keys that worked were the first and last. Sorry if I am using the wrong terms, I am a beginner!

If you see this don’t waste your time. I asked a different question and I got my answer.