05 focus estate locking fault?

i have a 05 focus estate and the central locking is not properly working.when i press lock on the fob it will lock all except drivers door!also the boot wont open from fob (doesnt have a button on inside for boot)
i have reset the key fob and still nothing.the drivers door lock inside is always pushed down as tho its locked only it isnt.
dont fancy a big bill from ford so just seeing if anyone has any ideas.