How do you unlock a locked Excel spreadsheet?

If the worksheet is protected, do the following:
  1. On the Review tab, click Unprotect Sheet (in the Changes group). Click the Protect Sheet button to Unprotect Sheet when a worksheet is protected.
  2. If prompted, enter the password to unprotect the worksheet.

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How do you remove protection from an Excel document?

Open the workbook that you want to change or remove the password for. On the Review tab, click Protect Sheet or Protect Workbook. Click Unprotect Sheet or Protect Workbook and enter the password. Clicking Unprotect Sheet automatically removes the password from the sheet.