It sounds like the disc slot has an issue.
Most times it is one of the following:
- The slot opening in the plastic case has been compressed
- The felt lining the slot opening has gotten damp and became stiff
- Perhaps the felt lining the slot is damaged and is partially blocking the opening.
For issues 2 & 3 examine the felt in the slot opening to see if there is an issue. Sometimes carefully running something along the slot can either "soften" the felt a bit or move it out of the way just enough to allow the disc to eject or allow you to grab the disc if you are quick enough. Be careful using tweezers or pliers to grab the disc as you may damage the disc.
For issue #1 I have used a flat blade screwdriver (larger size is better) to gently twist the blade in slot opening to try to gently bend the pot metal frame surrounding the slot. Usually I place the blade about 1/3 of the way from each side. You don't want to insert the blade beyond the opening or you can damage the optical drive. The frame on the Top Case is what is bent/compressed, the drive itself isn't part of the problem. If you twist the blade too much you will crack the very fragile pot metal. Even with this method I've had to use the screwdriver to hold the slot open when ejecting the disc and quickly pulling it out so the disc doesn't go back in.
Otherwise you will need to have someone open the laptop, remove the optical drive and remove the top of the optical drive so that the disc can be lifted out.