Animation ignores yield and plays next one

I have script,that plays animations according to "tap" value.I wanted to wait for these animations to end before playing next so I have added yield,but it doesnt change anything.Here's Script

   void Update(){
             timer = Time.timeSinceLevelLoad;
             if (tap == 0){
                 anim.SetInteger ("Yatak",0);
             }
                     if (Input.GetKeyDown (KeyCode.J)){
                     LastPress =   Time.timeSinceLevelLoad;
                     if (tap > 2){
                         tap = 1;
                     }else{
                         tap++;
                     }
                     StartCoroutine(ComboJ());
                 }
                 if(timer - LastPress > 1){
                     tap = 0;
                     if(timer - LastPress < Atime){
                         attack = false;
     
                     }
                 }else{
                     attack = true;
                 }
             }
     IEnumerator ComboJ (){
             if(attack){
                 switch (tap){
                 case 0:
                     anim.SetInteger("Yatak",0);
                     break;
     
                 case 1:
                     Atime = 1f;
                     anim.SetInteger("Yatak",1);
                     yield return new WaitForSeconds(1f);
                     break;
     
                 case 2:
                     Atime = 1f;
                     anim.SetInteger("Yatak",2);
                     yield return new WaitForSeconds(1f);
                     break;
     
                 case 3:
                     Atime = 0.35f;
                     anim.SetInteger("Yatak",3);
                     yield return new WaitForSeconds(0.35f);
                     break;
                 }
             }
         }