Answer:
I am pinched by grandmas
I have 24 keys but cannot open any locks. Sometimes loud, sometimes soft. What am I?
The more you have me the less you see. Shine a light on me and I shall flee.
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
I help engines spin and pants stay up.
Keep doing me to avoid lens dryness