If you need it for testing purposes you can just use [taskkill](https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/taskkill) on the command line. I believe, `taskkill /f /pid <processId>` should forcefully end the process without any cleanup.
Another option is to simulate shutdown inside a Windows VM, that's probably the second best thing to test a real blackout.
