This question comes from the “what if everyone just wants to do nothing” to justify the existence of a system in which if you are not able to work you die.

Everyone is guaranteed a job, so if they don’t want to then they will just have less money to go around, or maybe they wouldn’t even need to if what they did is automated. However, regardless of whether they work or not, they are guaranteed food and housing. So they just get to do whatever they want. In a communist system someone livelihood is not tied to a job.