How to Create Trigger to update User if Account Type "Prospect" then deactivate User otherwise Active

Hello friends today post , create a trigger on Account, if account record type change in "prospect" then user deactivate and other type activate user ....
so let us start ........

Step=>1. Create a trigger on Account
                   goto developer console , File=>New=>trigger

                     updateUser on Account

                    trigger name:- updateUser.apxt

trigger updateUser on Account (after update) {
    Set<Id>allId=new Set<Id>();
    for(Account a:Trigger.new){
        if(a.Type=='Prospect'){
            allId.add(a.Id);
            deactivateHelper.updateUser(allId);
        }
    }
}

Step=>2.
               create a Future method of Apex class
               goto File=>New=>Apex Class
             Apex class name:- deactivateHelper

global  class deactivateHelper {
    @future
    public static void updateUser(Set<Id>allId){
        System.debug('result'+allId);
     
        Contact clst=[SELECT Id,Name,Email from Contact WHERE AccountId=:allId];
        System.debug('Contact deatails=>'+clst);
        List<User>userListToDeactivate=new List<User>();
        userListToDeactivate = [SELECT Id,Name from User where username=:clst.Email];
        System.debug('User details=>'+userListToDeactivate);
        if(userListToDeactivate.size()>0){
            for(User u : userListToDeactivate){
                u.IsActive = false;
            }
        }
        System.debug('User=>'+userListToDeactivate);
        update userListToDeactivate;
    }
 
}

Note: @future is a annotation of future method.

                                        Output:

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