Please help me with my Sony PS3!?

Okay.. My ps3 had major problems accepting discs in the past... like i have to hold the eject button for 15 secs and wait for the disc tray to like manually accept... but now my ps3 won't even accept the disc. I MEAN PHYSICALLY.. like it has a lock in front of the tray... preventing any discs to go in there... what should i do??? I think my warranty is gone tooo... Please help me! and the ps3 is on of em FAT ones... the 80 gb version with only 2 usbs