"Turn off your PS4 by holding the power button until the system shuts off completely.
Unplug all of the cords that are connected to your PS4 from the system directly.
Place the PS4 vertically. The disc usually gets stuck when the console is horizontally resting. Placing it vertically may help dislodge it.
Wait about 30 minutes.
Reconnect all of the cords.
Boot into safe mode by holding the power button for 7 to 8 seconds.
Cross your fingers. That's really it. The disc should hopefully eject now."
There is a small black screw located in-between the vents. You will see two sections of tightly packed slots and on single slot somewhat separated. This is where the screw is located. Use a Phillips screwdriver and rotate the screw counter-clockwise. This shouldn't require very much pressure and you should see the stuck disc slowly come out of its slot after a few twists.
send it in to Sony for repairs, or contact PlayStation Support for more information.