Identify unused folders

I’m trying to identify folders on a data share which haven’t been used in a long time.
My idea was to loop through all folders, and for each folder loop through all files to get the LastAccessedDate. For testing purposes I’m now trying to list all folders and identify the file with the latest LastAccessedDate. However, I only get one result, which isn’t even in the folder I specified.
Probably something simple I’m missing, but would be glad if someone could help me out.
Or, if there’s an easier way to accomplish the same thing, I’d like to hear it.
Here’s my code:

Function Get-Folders

    # Get all subfolders
    $folders = Get-ChildItem -Path $path -Recurse -Directory -Force

    # Loop through all files in each subfolder and display newest lastaccesseddate
    foreach ($folder in $folders)
        $lastDate = Get-Date "01/01/1970"
        $lastFile = $null

        $files = Get-ChildItem -Path $folder -File -Force -ErrorAction SilentlyContinue

        foreach ($file in $files)
            if ($file.LastAccessTime -gt $lastDate) 
                $lastFile = $file
                $lastDate = $file.LastAccessTime

        Write-Output $lastFile.FullName
        Write-Output $lastFile.LastAccessTime

No need to create a custom function to search for files by lastaccesstime. Use below.

Get-ChildItem $path -Recurse -File | Where-Object {$_.LastAccessTime -gt $lastDate}

:point_up_2:t4: !! For some file types a Get-ChildItem updates the LastAccessTime !! :point_up_2:t4:

… you may check that in advance with test files