Holding the power button in for 20-30 seconds should force it to shut down.
Long shutdown is usually a service or program waiting for something to happen, that never does, hard to find.
Try downloading the free version of CCleaner (ignore all the paid versions and the requests to install Chrome or AVG
) and run the registry scan, then "review selected issues", say no to backup, hit fix all selected issues, close it and reboot. I've been using it for 15 years or so and it works really well. Also does all sorts of other good things like cleaning unwanted files, startup items and so on.
https://www.ccleaner.com/ccleaner/download