Sure! Here's an example of an HTML file with JavaScript code that implements the game you described. The game starts immediately when you open the HTML file in a web browser, and the person will continuously walk forward until the timer runs out.
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To use this code, save it in a file with a ".html" extension, then make sure you have an audio file named "sound.mp3" located in the same directory as the HTML file. Finally, open the HTML file in a web browser on your smartphone, and the game will start automatically. The person will walk forward indefinitely until the 10-minute timer ends, at which point the dog breaks free of the leash. Elevator music will play during the entire 10-minute duration.