I Am Unable To Play Movies Because The Cartridge Does Not Stay Closed

NOTE: If the disc tray does not open, it could mean that the player is locked (also known as child lock). The steps to lock on unlock the DVD player are different depending on the model being used. Refer to the product manual for model specific information. Manuals are posted on your model support page.

Follow the procedure below if the DVD player will not accept the disc or keeps ejecting discs.

1. Turn off the DVD player.
2. Unplug the power cord of the DVD player from the electrical outlet.
3. Allow the DVD player to remain without power for one minute.
4. Plug the power cord back into the electrical outlet.
5. Turn on the DVD player.
6. Attempt to insert the disc into the DVD player.

NOTES:

• The troubleshooting steps listed above should resolve the issue of the DVD player not accepting a disc. If you have completed all of the steps and the issue is not resolved, service may be required. Go to Product Repair.
• If you are experiencing a different disc playback issue, refer to how to troubleshoot disc playback issues on the DVD player.
• A separate article is available if the disc tray will not open or eject

Please check this link for reference

https://www.sony.com/electronics/support/articles/...

Check this video tutorial for reference

Thanks