Please how to determine torque and force at center of mass of a tilted block with uniform density, width $w$ and mass $m$ making an angle $\theta$ with ground?

I have an idea:

If the block is resting only on the bottom left corner, calculate torque at bottom left corner. Calculate rotation due to torque around the corner in an interval t. Compute equivalent displacement from the center and rotation around the center. Compute torque and force at center of mass from displacement and rotation in the interval t.

If the block is resting only on the other corner do the same but with this latter.

I wonder how to calculate torque at a corner and if my idea is correct.