To force shutdown a MacBook without the eject Key, you can use the following keys:
Command + Control + Option + Power button
After a few seconds, your MacBook will shutdown and you can restart it with pressing the power button.
A force shutdown could be helpful if your MacBook won’t work after falling into sleepmode.
Before you do this, you should try to force quit applications by pushing this keys:
Command + Option + Esc

Related Works