Excel to DataTable using EPPlus - excel locked for editing

I'm using the following code to convert an Excel to a datatable using EPPlus:

public DataTable ExcelToDataTable(string path)
{
    var pck = new OfficeOpenXml.ExcelPackage();
    pck.Load(File.OpenRead(path));
    var ws = pck.Workbook.Worksheets.First();
    DataTable tbl = new DataTable();
    bool hasHeader = true;
    foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column])
    {
        tbl.Columns.Add(hasHeader ? firstRowCell.Text : string.Format("Column {0}", firstRowCell.Start.Column));
    }
    var startRow = hasHeader ? 2 : 1;
    for (var rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++)
    {
        var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];
        var row = tbl.NewRow();
        foreach (var cell in wsRow)
        {
            row[cell.Start.Column - 1] = cell.Text;
        }
        tbl.Rows.Add(row);
    }
    pck.Dispose();
    return tbl;
}

It creates the Excel, however, when I try to open it, it gives me the message that it is locked for editing by another user and that I can only open it in Read-Only mode.

I thought using:

pck.Dispose();

would solve the issue, however I'm still getting the same error.

Also, when I try to delete the file, I get the message: The action can't be completed because the file is open in WebDev.WebServer40.EXE.

Any ideas how to resolve this? Thanks in advance. :)