Hi and welcome to the site,
Initially, postback with the model number.
BLOCKED as it implies indicates that the tray could not slide out; a common problem with some Philips models. Fix is to replace the DVD deck mechanism. Workaround is to always leave a disc inside.
Offhand, on most Philips models, there would be a manual eject slot at the bottom of the unit as shown in the representative image below.
Good luck and thank you for asking.