How to restart an Apple laptop with a sealed battery?

As a last resort, people wanting to restart a frozen laptop usually need to remove the battery for a while and then put it back in place. But that solution may not work with the new Apple's models whose batteries come sealed and therefore can't be removed. In such situations, there is two ways to go about the problem.
One consist of holding the power button continuously for 5 to 10 seconds, wait a few seconds and then press the power button again; doing so, should restart the laptop.
The second way to restart a frozen Mac laptop with a sealed battery, is to press Control and Command keys simultaneously with the power Button.