excel - Workbook is not closing when using Workbook.Close method

I'm trying to open and then close a workbook but my problem is after using Workbook.close method the workbook remains open and can only be killed by task manager.

I found the answer from the below link VBA won't close workbooks opened programatically
but for my application it doesn't work...
Here the code:

Private Function writeInWB(myFile as String) As Variant
    Dim xl0 As New Excel.Application
    Dim xlwBBGTerm As New Excel.Workbook 
    Application.ScreenUpdating = False
    Set xlwBBGTerm = xl0.Workbooks.Open(myFile)
    GoTo ErrorHandling

ErrorHandling:
Application.ScreenUpdating = True
If xl0.Workbooks.Count > 0 Then
    xlwBBGTerm.Close SaveChanges:=False
    xl0.Quit
End If
End Function