Prompt: Write a short story about a man who discovers a magical portal

The man was walking down the street when he saw a mysterious portal. He was curious so he walked through it. When he entered, he found himself in a different world. In this world, the man was the only human. He was alone and he had to figure out how to get back home. The man was journey was full of challenges, but he eventually discovered the way back home. When he arrived back home, he found that everything had changed.