Check-PendingReboot.ps1

            $PendingReboot = Invoke-Command -ComputerName $Target -ScriptBlock `
            {
                #Checks if the registry key RebootRequired is present. It is created when Windows Updates are applied and require a reboot to take place  
                $PatchReboot = Get-ChildItem -Path REGISTRY::"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired" -ErrorAction SilentlyContinue  
                #Checks if the RebootPending key is present. It is created when changes are made to the component store that require a reboot to take place  
                $ComponentBasedReboot = Get-ChildItem -Path REGISTRY::"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending" -ErrorAction SilentlyContinue  
                #Checks if File rename operations are taking place and require a reboot for the operation to take effect  
                $PendingFileRenameOperations = (Get-ItemProperty -Path REGISTRY::"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager" -ErrorAction SilentlyContinue).PendingFileRenameOperations  
                #Performs a WMI query of the configuration manager service to check if a reboot is pending  
                $ConfigurationManagerReboot = Invoke-WmiMethod -Namespace "ROOT\ccm\ClientSDK" -Class CCM_ClientUtilities -Name DetermineIfRebootPending | select-object -ExpandProperty "RebootPending"  
            
                If (($PatchReboot -eq $null) -and ($ComponentBasedReboot -eq $null) -and ($PendingFileRenameOperations -eq $null) -and ($ConfigurationManagerReboot -eq $false)) {  
                     Return $false  
                } else {  
                     Return $true  
                } 
            }

            if($PendingReboot)
            {
                Invoke-Command -ComputerName $Target -ScriptBlock { Restart-Computer -Force }
                Remove-Job -Id $Computer.ID
            }
        }