If the disk of your Nintendo Wii console is stuck, make sure that you press the eject button, if it does not eject, then press and hold the eject button for 5 seconds to ensure that the console is reading the command.
If that does not work, then restart the device and press and hold the eject button again.
If it does not eject still, unplug the device and wait for a minute or two, and power it back on and press and hold the eject button.
If you hear a wheezing sound that indicates that the console is trying to eject the disk, try lifting the console to an angle so as to help it eject the disk.
If none of these worked, you will have to send your Nintendo Wii for repairs.