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Hi Carnea,
Thanks for posting back.
For "it did not work", I suppose you mean this user can still see the document. If so, this means the user still has access to this file. I recommend you check the access for the file. Go to the SharePoint library in the browser, select the related file, click the three dots, Manage Access, and make sure this user is not under the People tab. If you can still see this user, you can select this user and remove this user's permission. After that, you can wait for a few minutes, and then check the result.
If this user can still see the document after checking the above steps, please check this user's permission. Select the related file, click the three dots> Manage Access> In the Manage Access dialog, click the three dots in the upper-right corner and select Advanced Settings> click Check Permissions> input this user and check permissions. After that, please take a full screenshot and click "Insert Image" to upload it.