Can a man really put himself in the friendzone with no way for recovery?

Why is the friendzone something that has such a bad reputation?

Is the difference between a friend and a lover really just the level of attraction?

What should someone do to increase their chances to move away from the "friendzone" and into the "loverzone", this of course under the assumption that they want that.

EDIT: Another possibility i just thought about. What if they have been friends for a while and one just recently developed feelings/attraction?