function Get-ScriptBlock {
    $var = "Success!"
    return { $var }
}

function Get-Closure {
    $var = "Success!"
    return { $var }.GetNewClosure()
}

$var = "lol #fail"

Write-Host "ScriptBlock: $(& (Get-ScriptBlock))"
Write-Host "Closure: $(& (Get-Closure))"