Are you a dependent? If you are, you might want to reconsider until you find a way to move out within 6 months from the end of the year.
I live with a family member and they don't know I cam. I'm moving this month in order to be able to escape being filed as a dependent with enough time to make it seem reasonable that I made 9K (after 9k income you can no longer be a dependent.)
I cam when the family member is asleep/at work. At night I KNOW they won't come into my room and their room is also down the hall quite a bit. I don't have a lock either.
I think you should first assess the risks of doing this if you know that they might freak out if they find out somehow, as well as the whole tax thing if you're a dependent. Research what it means to be considered a dependent and start your decision there.
This was a huge mistake I made but thankfully I didn't pass the threshold to have to tell my parent how much I made (you have to do that if you make over ~4k.)
If you don't plan on making more than 4k, I say go for it. You still have do file taxes though once you make $400 and tax stuff will be mailed to your address. Also, PO box didn't work for me for MFC but thankfully nobody opens my mail.