The used term "Voluntary Work" has to be considered descriptional more then anything else and can therefore be used, IMO.
We´re once more are raising a generation of egoists, aren´t we? Calling for parents since years, but they´re too busy these days with their own, loads of these from the outside generated, problems and their lifes in general. They a kind of have failed and gouvernment can´t build prisons forever, can they? Action is needed here.
These 40 hours are a good idea as it will, for some few hours only, teach younger people more then their teacher in school, due to many reasons, would be able to archieve anyways. Finally, at the end of the day these young people will find it a most interesting experience, who know´s.