sliding door power locks

If you could supply a dedicated door pin I could design a circuit to make it work.  It seems like it would be pretty simple, but laying it out there is a lot to do.

I'm thinking of something like this:

If a (-) pulse is outputted to lock the door, but the door pin indicates the door is open the circuit will set a flag.  The circuit will then continue to monitor the door pin and wait for it to drop out.  Once it drops out the circuit will output a (-) signal for 0.8 seconds.

If a (-) pulse is outputed to lock the door and the door pin shows the door is closed it will lock as normal (0.8 second pulse).

Thoughts?

I'm not sure how you would integrate a latching relay - perhaps you could have the relay latch if the lock button is pushed and the door is open, but you will still need some sort of control for timing the "lock" once the door is closed.

If you are interested in my circuit I can build it and test it and ship it to you.  All I would ask is that you pay for the actual cost of parts and shipping.  This actually sounds like a fun Saturday project.