Lemon juice for lightening hair?!?

Really want to lighten the tips of my hair! I have brown hair (like Nutella colour) and I really want to get the tips lighter/blondish! My parents won’t let me dye it because they think it will ruin my hair. So does lemon juice then going in the sun work? What will it turn out like? What do I have to do? How long does it take to come out? Will it turn ginger?

I am all for natural things too. I have long-ish curly hair! Basically typical surfer hair but naturally brown!