Release SharePoint file lock using PowerShell

Release-File.ps1

param(
	$webUrl = "http://demosite",
	$listTitle = "testlib",
	$itemID = 183
)

clear-host

$web = Get-SPWeb $webUrl
$list = $web.Lists[$listTitle]
$item = $list.GetItemById($itemID)
$file = $item.File
$lockType = $file.LockType

if($lockType -ne "None")
{
	$userID = $file.LockedByUser.ID
	$user = $web.AllUsers.GetByID($userID)
	$lockID = $file.LockId
	
	write-host "file locked"
	write-host "user id $userID"
	write-host "lock type $lockType"
	
	$file.ReleaseLock($lockID)
	write-host "file unlocked!"
}
else
{
	write-host "file not locked"
}