While depressing the connector lock, insert the flat end of a heavy duty spudger into the gap between the power supply connector and its socket.

Twist the heavy duty spudger to slightly separate the connector from its socket.

It will be necessary to work from alternate sides until the connector is free.

Your power supply may have an ambient light sensor cable attached from the power supply to the logic board. If so, carefully use a spudger to push out the cable towards you using the sides of the cable alternatively to help you slide it out.