Hi my name is EricWelcome to Just Answer, I hope I can help you with your issue.I have over 30 years experience as a technician in electronics.
Don't panic I can assist
Unplug the player from the wall for a minute, then plug it in and hit the eject button over and over
if it says open, stop hitting the button, the disc should eject.
if this doesn't work you can open the player and remove the disc manually using a philips screw driver, do not try to pry the door open.