IF - ELSE Issue! (Help! I'm new to this)

Hey all, I'm just learning how to script using javascript for Unity. I've just started and learnt a bit about if and else statements, however I am pulling my hair out of frustration now able to work out an error I keep having. I've been through a lot of answers on this website for the trouble I'm having and nothing seems to be helping. I keep getting

 'BCE0044: expecting }, found 'else'.

Here are two scripts I wrote, A) gives me errors, B) doesn't. Sorry if this is an easy fix, I have researched and I cannot find any answers as to what is wrong with my script.

Script A) (Gives me error codes)

      var pickupKey         = true;                                    
     var openDoor         = false;                                
     var numberOfKeys    = 1;                                    
     var keysAmount         = 0;                                    
 
 
 function Start (){
 }
 function Update (){
        numberOfKeys = numberOfKeys + 1;
      keysAmount = numberOfKeys;
      print (numberOfKeys);
      
           numberOfKeys = numberOfKeys + 1;
            keysAmount = numberOfKeys;
      print (numberOfKeys);
      
          numberOfKeys ++;
          print (numberOfKeys);
          keysAmount = numberOfKeys;
          print ("You have " + keysAmount + " keys in your bag!");
          print ("Because of this....");
          
          if (keysAmount >= 3);
          {
              print ("The door has now opened!");
              openDoor = true;
              numberOfKeys -= 3;
              
               print ("Now you have " + numberOfKeys + " keys");
          }     
          
          else
          {
              print ("Not enough keys to open the door");
              }
 
 }

SCRIPT B) (No error codes but I don't see anything I did any different)

 function Start () {
 }
 
 function Update()
 {
 
      var luckyNumber = 6;
      
      if (luckyNumber == 5)
      {
          print ("Lucky number equals 5");
      }
      
      else
      {
          print ("Lucky number does NOT equal 5");
          }
 }

Thank you for your time and sorry if this was a bit hard to read, this is my first time using this website so I was a bit unsure how to format this post to make it look cleaner. Please tell me what I've been doing wrong.