Some options based on what permissions your admins allow
Paste the following directly in PowerShell or put into PowerShell ISE then highlight the line and click "Run Selection (F8)" to run even if running scripts is disabled via Execution Policy.
$wsh = New-Object -COMObject WScript.Shell; while (1) {$RND = Get-Random -Minimum 30 -Maximum 120; $wsh.SendKeys('+{F15}'); Write-Host "$(Get-Date)"; Start-Sleep -Seconds $RND}