I understand what OP means, for this issue: considering the example above of your story, that worker can accept for the sake of food and clothing or for the sake of family life or children that he chooses a job to earn money that he does not like or does not have the time and necessary conditions. Even in my country, university graduates cannot find a job in their major, and life forces them to choose another profession to earn a living. That is a forced choice. On the contrary, if that worker chooses a job that is not interesting but has a better salary than their favorite job, it means that the worker chooses and accepts their opportunity to earn money, basically going to work to earn money.
Yes, this is a reality of life that cannot be separated from the finances we experience in this world or in any country. In cases like this we can also see that job choices are often influenced by several factors, including the economy in their lives and the large number of competing job applicants and few opportunities for work. Yes, we inevitably accept these jobs where workers have no other choice but to accept jobs they don't like to support their family's needs, I don't agree with this regarding office workers being slaves.
Yes, it depends on the person whether to take this golden opportunity or not, of course with every big salary there is a target that must be achieved. Not everyone can accept the challenge of a company.