function IsFileLocked($filePath){
        #write-host $filePath

        Rename-Item $filePath $filePath -ErrorVariable errs -ErrorAction SilentlyContinue
        $errs.Count
        if ($errs.Count -ne 0)
        {
            return $true #File is locked
        }
        else
        {
            return $false #File is not locked
        }
    }

 $Path= "$env:temp"
    if ((Test-Path -Path $Path) -ieq $true)
    {
    $Daysback =  '-30'
    $CurrentDate = Get-Date
    $DatetoDelete = $CurrentDate.AddDays($Daysback)

    get-childitem $Path -recurse  | Where-Object {$_.LastWriteTime  -lt $DatetoDelete } |
    Where-Object {$_.PSIsContainer -eq $False }| Where-Object {(IsFileLocked -filePath "($_)") -eq $false }# | remove-item   -force #-WhatIf
    }

$old = (Get-Date).AddDays(-30)

Get-ChildItem $env:TEMP -Recurse |
Where-Object {!$_.PSIsContainer -and $_.LastWriteTime -lt $old } |
Remove-Item -Force -ErrorAction SilentlyContinue