My first job was in the Hospital Secretary's department of a psychiatric hospital. It was a very busy job and I always had plenty to do - as did my colleagues.
Following that, I mostly worked in the private sector, spending the majority of my working years in provincial and central London law practices. In the last few years of my working life I re-trained as an adult literacy teacher for adult education services - and that was a job which was emotionally rewarding but extremely hard work and, given the number of hours required to do the job properly, very poorly paid. In the end, I was so exhausted and out-of-pocket that I had to return to work in a law firm.
When my children were very young I did a lot of temping in both the private and public sector. Some of these jobs were very busy and stressful, and some were not - and that wasn't dependent on whether they were in the public or the private sector. However, private sector jobs were generally better paid.
Whilst some jobs are not 9-5 type jobs, it is possible to adequately cover the hours needed through the use of shifts. This is done anyway in many jobs, such as nursing, public transport, etc, etc.
As I said before, any change in working hours or pay is always met with people throwing their hands up in horror and saying that it is not feasible. My feeling is that workers who are not physically and mentally exhausted are likely to be far better employees - and parents - and generally more productive within our society. People who are tired and trying to do too much over the course of a long working day are also likely to have low morale, poor motivation and little commitment and loyalty to a job or employer.
I accept that it would be quite challenging to try and make changes to working hours, but just because difficulties are likely to be encountered at first and adjustments made to meet them, that is no reason to just dismiss the whole idea. After all, radical changes were made in the past and the country didn't fall apart.