I'm going to lock my sister in the closet.
Why do you want to do such a thing to your own sister?
Because her voice gives me a headache and she is always causing disturbances.
No matter how disturbing you find your sister you must not be so mean to her. Just ask her to behave instead of locking her in closet.
I just want to teach her a lesson and if I lock her in a closet, I think she will chill out.
If your parents find out you could be in big trouble. Talk to your parents if she keeps being annoying they can ground her for being annoying.