Sheriff's deputies say a man is stealing wallets and keys from locker rooms of fitness centers.In one case, the man used stolen keys to take a car from a parking lot, then used the victim's credit card at a Comstock Park gas station.Police say the thief enters lockers rooms, looks for unlocked lockers and takes valuables, in particular, wallets and car keys. Once he determine which vehicle in the parking lot matches the keys, he then steals valuables.Police urged those using fitness facilities to use locks on lockers. Anyone who can identify the man in the surveillance photo is asked to call Silent Observer at 774-2345 or send a message through the Sheriff's Department's Facebook page.