Unlock all the items in Sitecore locked by specific user

We can use any of the below PowerShell scripts to unlock the all items.

Get-ChildItem master:\content -rec -Language * | 
  Where-Object { $_.Locking.GetOwner() -eq "sitecore\USERNAME" } | 
  % { $_.Locking.Unlock() }

or 

$script:counter = 0
$script:unlockedCounter = 0

$owner = $user.Replace("\","\\")

function Unlock-Item-And-Descendants {
    param(
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
        [Sitecore.Data.Items.Item]$item
    )

    if ($item["__Lock"] -match $owner) {
        Write-Host "Unlocking" $item.Paths.ContentPath ":" $item.ID
        Unlock-Item $item #| Out-Null
        $script:unlockedCounter++
        if ($script:unlockedCounter % 500 -eq 0) {
            Write-Host "$script:unlockedCounter items unlocked"
        }
    }

    $script:counter++
    if ($script:counter % 500 -eq 0) {
        Write-Host "$script:counter items reviewed"
    }

    foreach ($childItem in $item.Children) {
        Unlock-Item-And-Descendants -Item $childItem
    }
}

Unlock-Item-And-Descendants -Item $root

Write-Host "Unlocked $script:unlockedCounter total items"
Write-Host "Reviewed $script:counter total items"