Definitely. Fanfiction allows for a lot of creativity. A human might pick up Thor's hammer if the writer wants to explore the character development that comes with such an event. Maybe the human has been underestimated all their life, and when they lift the hammer, it shows that true worthiness doesn't always come from physical strength or fame. It could be a story of an underdog rising to become a great hero, all because they were able to pick up Thor's hammer.
Sure. In fanfiction, the concept of worthiness can be redefined. A human could pick up Thor's hammer if the story is exploring a different take on what it means to be worthy. For example, a human who has faced great adversity and still maintained their integrity might be able to lift it. Or perhaps a human with a unique connection to the Asgardian magic through some long - lost heritage could do so.
In fanfiction, yes, a human can pick up Thor's hammer. Fanfiction often bends the rules of the original lore. It might be that the human has some special quality that makes them worthy, like an extremely pure heart or a selfless act they've just committed.