Friend zone is a myth created by guys to justify the fact that the girl just simply does not find them sexually attractive.
Pretty much nails it, though there is a tendency for a girl to fight urges to be attracted to someone they've been friends with. This is the only real friend Zone, but that one is easily crushed. The type most people talk about can not be beaten because it is just as you said. They just arent attracted.
Being a Donny little ***** about it just makes you less attractive. Women like confidence and apathy. Dead ass, act like you just want to be her friend and start dating other girls. Act like you're NOT attracted to her then she will desire your attraction, don't give in. Act like she isn't your type. This will eventually start to bother her as she sees you dating other girls and finding other girls attractive but not her. Eventually she will wonder why she isn't attractive then eventually start to get jealous (if you're close friends that is).
This can work but takes a lot of time and patience. You also have to make yourself more attractive. Don't be whiny, be confident, don't be quiet, be fun, don't be a lazy out of shape *****. Start working out, and biggest one of all, find a passion that is NOT comic books. Lol. Least attractive thing. Learn to play an instrument, fight in martial arts, or get really good at a sport. Don't just do something they do either.
Source- slept with many of my attractive female friends.