'Shut' in the Bible

Does a bird fall into a snare on the ground without any bait in the trap? Will a trap snap shut when there is nothing to catch?

Take away from me the noise of your songs; my ears are shut to the melody of your instruments.

The Lord said to me, “Amos, what do you see?” And I said, “A plumb line.” Then the Lord said,“Behold, I am setting a plumb line [as a standard]Among My people Israel [showing the defectiveness of the nation, requiring judgment].I shall not spare them any longer. [The door of mercy is shut.]

And he said, Amos, what do you see? And I said, A basket of summer fruit. Then the Lord said to me, The end has come to my people Israel; never again will my eyes be shut to their sin.