The lubrication inside your device may be insufficient or some mechanical problem has occurred inside preventing the device to open. Now, look at a very "small hole" near the Tray's front cover. If you see it, get a very small pin or even a needle to fit to that small hole. Now, press the "open" button in your device and then push that pin or needle in the hole at the same time to help the device to open.
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The lubrication inside your device may be insufficient or some mechanical problem has occurred inside preventing the device to open. Now, look at a very "small hole" near the Tray's front cover. If you see it, get a very small pin or even a needle to fit to that small hole. Now, press the "open" button in your device and then push that pin or needle in the hole at the same time to help the device to open.