Wait for function to exit before continuing foreach loop in PowerShell

I have a list of functions that get called in loop $listoffunctions. Some are run in RunspacePool (multithread) while others run in the main thread. The ones that run in main thread are forms with buttons.

I need the ones that run in the main thread (interactive forms) to finish before continuing the foreach loop with other functions in list.

$listoffunctions contains strings of function names with parameters sometimes like RichTextDocumentNewContext -Show and UseStoreOpenWith -Hide and PostActions.

$WinAPIList contains a list of function names that call up a form with buttons (form XAML and buttons) for user to interact with. So it contains function names like ScheduledTasks -Disable and ScheduledTasks -Enable. Foreach loop should wait for the user to finish interacting with this form completely and its background commands to finish.

foreach ($singlefunction in $listoffunctions)
{
    # PowerShell
    $PowerShell = [PowerShell]::Create() 
    $PowerShell.RunspacePool = $RunspacePool
    
    # These functions run in main thread which names are found in WinAPIList
    if ($WinAPIList -contains $singlefunction){
        [void]$PowerShell.AddScript({Write-Output "Main Thread Run"})

        # This runs the function but I need it to wait for it to end before continue foreach loop   
        #$sb = [scriptblock]::Create($singlefunction)
        #& $sb
        
        # This does not work
        Start-Job -Name Job1 -ScriptBlock {$singlefunction}
        Wait-Job -Name Job1
        
    }
    # These function are run in the RunspacePool (Multithread)
    else{
        # Add script (function) to run

        [void]$PowerShell.AddScript($singlefunction)
    }
}

This does not work

# This does not work
Start-Job -Name Job1 -ScriptBlock {$singlefunction}
Wait-Job -Name Job1