PHP Game: Stop SQL Execution Until Specific Seconds Have Gone Past

[dotPHP]

Hello. I am creating a PHP game, and I am stuck on a small line of code. Basically, when users have a job, and when they click a button to go to work, they'd be paid one hour later (as in, the SQL query will be executed one hour later). I am testing it so the time is at 10 seconds, so it shouldn't update for 10 seconds, but instead it is executed automatically. Here is the pastebin: http://pastebin.com/d63fbbabe