The disc tray does not open and you cannot remove the disc even after you press 
Please follow the procedure below:
The disc tray does not open and LOCKED or TLK ON appears on the front panel display.

Please follow the procedure below:
- Turn off the player and disconnect the AC power cord.
- Reconnect the AC power cord while pressing down the
(Open/Close) button on the player. - Keep pressing down the
(Open/Close) button on the player until the tray opens. - Remove the disc.
- Depends on the model:
- When WAIT appears in the front panel display, hold down
on the player for more than 10 seconds until the player turns on again. - When OPEN appears on the front panel display, hold down
on the player for more than 10 seconds until the player turns off.
- When WAIT appears in the front panel display, hold down
The disc tray does not open and LOCKED or TLK ON appears on the front panel display.
- When LOCKED appears, the player is locked. To cancel the Child Lock, hold down
on the player until UNLOCK appears on the front panel display. - When TLK ON appears, contact your Sony dealer or local authorised Sony service facility.