Explorer Opens Mysterious Door to Alien Worlds

the prompt

Create a 15-second cinematic science-fantasy 3D CGI sequence with ultra-realistic environments, realistic human animation, atmospheric lighting, sophisticated camera movement, and premium theatrical visual quality.
Title: THE LAST DOOR ON EARTH
Setting: An abandoned modern city at dawn. Empty streets, silent skyscrapers, broken traffic lights, drifting dust, and pale sunlight passing through clouds.
Main character: A solitary explorer wearing a dark gray coat, hiking boots, a canvas backpack, and a small brass key tied around his wrist.
Action:
0–4 seconds: He walks through the completely abandoned city and discovers one ordinary wooden door standing alone in the middle of the street.
4–8 seconds: He approaches and slowly opens it.
8–11 seconds: Behind the door is a breathtaking alien world with enormous floating mountains, glowing forests, violet skies, and gigantic waterfalls.
11–15 seconds: He steps through and turns around. Suddenly thousands of identical doors appear across the alien landscape and open simultaneously, each revealing a completely different world. Rapid cinematic pullback.
Style: surreal science fantasy, cinematic realism, spectacular world reveal, atmospheric depth, no dialogue.