What is special about Thor's Hammer is that the only "superhero" that can carry the hammer is Thor. He could carry it but no one else can in the Avengers movie.
2.Alan Pan built real-life Thor hammer is by sensor that scans the person's fingerprints and sees if it is recognizing the fingerprints if is Alan Pan.
3.Alan Pan is the only one to lift the "Thor hammer" is by the sensor that the hammer has. He is also the only one to move or carry it is by it being on top of metal because he put a magnet that holds the metal very tight that no one can carry.