Necessary torque of motor to move a door.
You need a "hanging scale" preferably "analog one".



Mount it to any place of the door and slowly pool at 90 degrees. Check what value does the scale show when doors start moving. Static friction is always higher than dynamic friction.

Torque = Radius * Force

Raduis is the distance between mounting place and door hinges.
Force is 9.81 times max value shown by the scale in kilograms.

Do this many times for many mounting points then take average.
Use safety margin of 50% (motor should have at least 150% of required torque)