Reboot computer if up time is greater than 5 days

The following script will reboot a computer if it has an up time greater than 5 days and does not currently have a user logged on.

Function Get-TimeStamp {
     
    Return "[{0:MM/dd/yy} {0:HH:mm:ss}]" -f (Get-Date)   
      
}

$LastBootUpTime = Get-WmiObject win32_operatingsystem
$Uptime = ((Get-Date) - ($LastBootUpTime.ConvertToDateTime($LastBootUpTime.LastBootUpTime))).Days

If($Uptime -gt 5) {
    $Explorer = Get-WmiObject Win32_Process -Filter "Name = 'Explorer.exe'"

    If($Explorer -eq $null) {
        Write-Output "$(Get-TimeStamp) - Uptime = $Uptime Days" >> C:\TEMP\ForcedReboot.log
        Write-Output "$(Get-TimeStamp) - Reboot Initiated" >> C:\TEMP\ForcedReboot.log
        Restart-Computer
    
    }
    Else {
        Write-Output "$(Get-TimeStamp) - Uptime = $Uptime Days" >> C:\TEMP\ForcedReboot.log
        Write-Output "$(Get-TimeStamp) - User is currently logged on.  Reboot has been postponed" >> C:\TEMP\ForcedReboot.log
    }
}