Start-Sleep pauses entire function - powershell

Question

I have a PowerShell script with a function to pull LAPS information when someone enters a computer name. What I'd like is to clear the output after 60 seconds so someone doesn't accidentally leave a password on their screen.
Seems as though no matter where the sleep is in the function (or even after) the script is paused for the 60 seconds, then displays the information and it never clears.
The part of the script that waits and clears:
Start-Sleep -s 60
$WPFOutputbox.Clear()
(look for my #TRIED HERE comments below)
function GETLAPS {
Param ($computername = $WPFComputer.Text)
try {
$LAPSComputer = Get-AdmPwdPassword -ComputerName $computername |
Select-Object -ExpandProperty computername
$LAPSDistinguished = Get-AdmPwdPassword -ComputerName $computername |
Select-Object -ExpandProperty distinguishedname
$LAPSPassword = Get-AdmPwdPassword -ComputerName $computername |
Select-Object -ExpandProperty Password
$LAPSExpire = Get-AdmPwdPassword -ComputerName $computername |
Select-Object -ExpandProperty Expirationtimestamp
} catch {
$ErrorMessage = $_.Exception.Message
}
if ($ErrorMessage -eq $null) {
$WPFOutputBox.Foreground = "Blue"
$WPFOutputBox.Text = "Local Admin Information for: $LAPSComputer
Current: $LAPSPassword
Exipiration: $LAPSExpire
SCREEN WILL CLEAR AFTER 60 SECONDS"
#TRIED HERE
} else {
$WPFOutputBox.Foreground = "Red"
$WPFOutputBox.Text = $ErrorMessage
}
#TRIED HERE
}
Instead the script will wait 60 seconds to show information, and never clear the screen.

Answer 1

Unless you create a separate thread, I would strongly advise against using the Start-Sleep cmdlet in Windows Forms or Windows Presentation Foundation as it will obviously stall the User Interface.
Instead, I would recommend to use a (Windows.Forms.Timer) event.
For this, I wrote a small function to delay a command:
Delay-Command
Function Delay-Command([ScriptBlock]$Command, [Int]$Interval = 100, [String]$Id = "$Command") {
If ($Timers -isnot "HashTable") {$Global:Timers = #{}}
$Timer = $Timers[$Id]
If (!$Timer) {
$Timer = New-Object Windows.Forms.Timer
$Timer.Add_Tick({$This.Stop()})
$Timer.Add_Tick($Command)
$Global:Timers[$Id] = $Timer
}
$Timer.Stop()
$Timer.Interval = $Interval
If ($Interval -gt 0) {$Timer.Start()}
}; Set-Alias Delay Delay-Command
Example
Delay {$WpFOutputBox.Text = ''} 60000
Parameters
-Command
The command to be delayed.
-Interval
The time to wait before executing the command.
If -Interval is set to 0 or less, the command (with the related Id) will be reset.
The default is 100 (a minor time lapse to give other events the possibility to kick off).
-Id
The Id of the delayed command. Multiple commands which different Id's can be executed simultaneously. If the same Id is used for a command that is not yet executed, the interval timer will be reset (or canceled when set to 0).
The default Id in the command string.

Answer 2

Call the function, sleep 60 seconds, then clear it. Do not put your sleep inside the function, put it where you call the function. Something like:
$WPFGetLAPSButton.add_click({
GETLAPS
# If no error, wait 60 seconds and clear the text box
If($WPFOutputBox.Foreground -eq "Blue"){
Start-Sleep 60
$WPFOutputBox.Text = ''
}
})
Pretty sure that'll do what you're looking for.