Ordering records on a continuous form

It has to be a single expression so:

Me.RecordSource = "Select * from Lock Order BY Lock Desc, Size Desc" 

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You can add as many expressions as you'd like.

You can also keep the way of setting the RecordSource of your Form and then on Form Level (e.g. via a button) add additional sorting ..
I used it a lot in continuous forms with many fields to have a click event on the Labels of the fields to dynamically sort.
The Code is like this :

Me.OrderBy = "Size DESC"
Me.OrderByOn = True

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Check the Ms Article on this : https://docs.microsoft.com/en-us/office/vba/access/concepts/forms-design/change-the-filter-or-sort-order-of-a-form-or-report

and FYI, a good way to learn SQL is to open the query designer, build what you need, and switch to SQL view and see the resulting statement.

You can go the other way as well if you already have a SQL statement.   Switch to design view, paste in the SQL statement, switch to design view and modify as needed, then switch back.

Jim.