Restart Timer Service on All Servers in Farm

[array]$servers= Get-SPServer | ? {$_.Role -eq "Application"}
foreach ($server in $servers)
{
    Write-Host "Restarting Timer Service on $server"
    $Service = Get-WmiObject -Computer $server.name Win32_Service -Filter "Name='SPTimerV4'"
    if ($Service -ne $null)
    {
        $Service.InvokeMethod('StopService',$null)
        Start-Sleep -s 8
        $service.InvokeMethod('StartService',$null)
        Start-Sleep -s 5
        Write-Host -ForegroundColor Green "Timer Job successfully restarted on $server"
    }
    else
    { 
        Write-Host -ForegroundColor Red "Could not find SharePoint Timer Service on $server"
    }
}