How do I convince my mother to let me put a lock on my bedroom door?

I m a 12 year old girl, and no matter how much I plead and reason with my mother, she won t allow a lock on my door. There is a big issue where her and my 24yo brother will just open the door/enter without permission, or even without knocking. I m not even sure if at my age I SHOULD have a lock, but I ve been... show more I m a 12 year old girl, and no matter how much I plead and reason with my mother, she won t allow a lock on my door. There is a big issue where her and my 24yo brother will just open the door/enter without permission, or even without knocking. I m not even sure if at my age I SHOULD have a lock, but I ve been reading a few articles, and the general consensus is that around about my age, a simple lock should be permitted.
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