PS3 wont read my disc

Hello my name is daniel and i just brought my new PS3 and i started to play Call Of Duty 5 with brothers and then 10 mins later my PS3 froze then we quit the game and tried to get back into the game and the PS3 could read the disc i dont have any idea waht to do plz help me!\r\n
ive tried clean the disc restarting the PS3 chnage games my big brother did everything he could still nothing plz help me!