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Some company (British Gas for instance) vans have a timed locking mechanism whereby if the driver leaves the vehicle unattended for more than 10 minutes or so it automatically locks itself. It can be a bit of a nuisance and I know of many drivers who disconnect the driver door lock as would appear to be the case in your instance.
Have you looked at all the other door locks to see if all is connected properly??
Currently in madnoel10's garage:
Honda Civic 1.4l