Taking legal action against your employer because you are bored at work seems laughable. The reverse would see employers suing employees for lack of performance. As this article shows there are some very active people who realise they are in the wrong job and do something about it to make a positive change. However there are others who carry on taking the pay and seem to offer little in return and with that attitude are unlikely to get a job elsewhere.
"I used to go and sit in the toilet cubicles. I would always be the most eager person to get up and make the tea. I would hide behind my screen and surround myself with files so I looked busy, but I wasn't doing anything."