This article suggests that you may be able to Control-click on the folder in the trash and choose Delete Immediately from the contextual menu.
It may also help to start up your Mac in safe mode and then try emptying the trash. You can keep holding down the Shift key after the login window to prevent other apps from launching.
I also see that @JBP’s folders have the com.apple.macl extended attribute, which can be troublesome to delete. It may help to temporarily disable System Integrity Protection and then try emptying the trash.