No need to reboot a system just to apply new permission settings. Instead, purge your Kerberos tickets so that you will get a new ticket based on the current permissions.
In PowerShell, use this command to purge all cached Kerberos tickets:
PS> klist purge
Current LogonId is 0:0x2af9a
Deleting all tickets:
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That's neat and all, but it's not a Powershell command...