C180 A Door as Solid as a Rock

I felt as if I were standing on top of the cliffs of the Grand Canyon.

I was secretly surprised, but I didn't give up. I tried a few more times, but it still didn't work. The strength of the door was beyond my imagination.

"Fuck, what door is this so hard?" I kicked a few more times, but it was useless.

However, there was a piece of glass in the middle of the door. If the glass was broken