how to open trunk without key

Since you ruled out the logical solution try a crow bar or removing the rear seat.

I think there is a button to unlock the trunk from inside the car. It is either on the dash, left side, or in the glove box.

There is latch release under the left side of the dash

The latch doesn’t work

I cant get out of valet mode

is there a way to open my trunk manually with the black key

yes it is but it's in valet mode