how can i recover an object -  looking up on a property - out of an array of custom objects ?

Hello,

how can i recover an object like we do in linq out of list of custom objects.

$collaborators = Import-Csv $PSScriptRoot/collaborateur.csv -Delimiter ';' 

$PeopleInObjects = @()

foreach($collabo in $collaborators)
{
    $pObject = New-Object  PSObject

    $pObject | Add-Member -MemberType NoteProperty "Matricule"       $collabo.Matr
    $pObject | Add-Member -MemberType NoteProperty "Firstname"       $collabo.Prenom
    $pObject | Add-Member -MemberType NoteProperty "LastName"        $collabo.Nom
   

    $PeopleInObjects += $pObject 
}

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// here how can i recover one object after it's lastname ?

thank you in advance