使用 PowerShell，取消保护 Excel 工作簿可以正常工作，但工作表不能

Question

As the title says, I can unprotect the workbook but not the worksheet. What am I missing?

Here's the code:

$WorkBook = $objExcel.workbooks.Open($_.FullName,0,1) #Path, UpdateLinks, Readonly, Format, Password
$QuoteSheet = $WorkBook.Sheets.Item(1)
$objExcel.AutomationSecurity = 'msoAutomationSecurityForceDisable'
$msoAutomationSecurityForceDisable=3
$WorkBook.unprotect("xxxx") <-- works
$QuoteSheet.unprotect("xxxx") <-- doesn't work

Answer 1

It turns out my workbook was opening to the second worksheet and not the first. While the pride in me would like to see this deleted, an example for how to unprotect workbooks and worksheets using PowerShell should be helpful to others in the future as Google has a hard time finding any.