How To Restart timer service on all servers in farm

[array]$servers= Get-SPServer | ? {$_.Role -eq "Application"}
$farm = Get-SPFarm
foreach ($server in $servers)
{
    Write-Host "Restarting Timer Job on $server"
    $Service = Get-WmiObject -Computer $server.name Win32_Service -Filter "Name='SPTimerV4'"
    if ($Service -ne $null)
    {
        $Service.InvokeMethod('StopService',$null)
        Start-Sleep -s 7
        $service.InvokeMethod('StartService',$null)
        Start-Sleep -s 7
        Write-Host "Timer Job successfully restarted on $server"
    }
    else
    {
        write-host -ForegroundColor Yellow "Could not find SharePoint 2010 Timer Service on $server"
    }
}