Access User Profile Service using Powershell

function GetInfo([string]$userAccount)
{

 $mailAttribute = "WorkEmail"

 $mail = ""

 $serviceContext = Get-SPServiceContext -Site $siteUrl
 $profileManager =  New-Object  Microsoft.Office.Server.UserProfiles.UserProfileManager($serviceContext);

if($profileManager.UserExists($userAccount))
{
        $userProfile = $profileManager.GetUserProfile($userAccount)
        $mail = $userProfile[$mailAttribute].Value
}

return $mail
}