It's not that he isn't listening, its because your son has limited grasp of language, intellectual concepts and attention, which is normal at this age. And hence, why homes are "baby proofed".
First, gain your child's attention so that he is solely focused on you. This can be the hardest part because the everything in the world to a small child is a big distraction. If you can't do that, you can't communicate anything to him. Second, realize that children of his age have a very weak "working memory" and "short term" memory. Thus for him to learn to follow your instruction, you must teach him over and over again before he is going to grasp what you mean. It can be tedious, but is effective and less necessary when he gets older (thank God). Hang in there.