Please don t bury the extension cord not even in conduit.
Run extension cord through door.
Use the chain to pull the wire up through the wall over the door and back down the other side.
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You can get a board that goes the full height of the door frame and is only an inch wide.
This left the door partially open which may allow pets out or insects in.
To run the wires inside rigid conduit you ll need a hacksaw a pipe bender capable of bending 1 2 in.
Stick a chain or heavy string through the hole and feed it along behind the wall until you can retrieve it at the open baseboard at the foot of the door.
Also having a cord hose run thru a doorway presents a tripping hazard or much worse allowing a metal door to close on a electric extension cord could damage the insulation causing a potentially fatal electrical hazard.
Extension cords are not rated to carry the same amperage as proper permanent wiring because the cords have tougher jackets which also retain more heat.
You can use one of those security bars for patio doors to lock it from the inside.
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Rigid conduit with an outside diameter of 3 4 in and a fish tape long enough to reach through the buried pipe.
Then you can close the sliding glass door.
Put a u shaped hole in the bottom so that it straddles your power cord.
Prior to the development of this product the cord hose would have to be routed thru an entrance door or window.
Use a vinyl raceway to secure the cable in the wall recession behind the baseboard.