Sweden's 23-hour work week
According to a new study by the Swedish Ministry of Finance (couldn't locate the original study or any English sources to cite), the Swedish work week is only 23 hours long. Unused work potential amounts to 15 million hours, which translates to 383,000 full-time jobs. Especially young people and immigrants suffer from this.
Add to this the aging population and the rise in associated costs and it becomes clear this needs to be addressed. But social democracies aren't well known for their ability to change employment policies. Expect things to get worse before they get better.