Dispatching an event in Laravel 5 on model created

I wan to create a Laravel signup system where I would send an email to verify the email once a user has signed up. I tried adding an event dispatched to the created method but I got an error

 Fatal error: Non-static method Illuminate\Contracts\Events\Dispatcher::fire() cannot be called statically

Here is what I came up with.

  <?php

namespace App;

use Laravel\Cashier\Billable;
use Laravel\Spark\Teams\CanJoinTeams;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\User as BaseUser;
use Laravel\Spark\Auth\TwoFactor\Authenticatable as TwoFactorAuthenticatable;
use Illuminate\Contracts\Events\Dispatcher as EventDispatcher; 
use Laravel\Spark\Contracts\Auth\TwoFactor\Authenticatable as TwoFactorAuthenticatableContract;

class User extends BaseUser implements TwoFactorAuthenticatableContract
{
    use Billable, TwoFactorAuthenticatable,CanJoinTeams;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'email',
        'name',
        'password',
    ];

    /**
     * The accessors to append to the model's array form.
     *
     * @var array
     */
    protected $appends = [

    ];


    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = [
        'card_brand',
        'card_last_four',
        'extra_billing_info',
        'password',
        'remember_token',
        'stripe_id',
        'stripe_subscription'       
    ];

    /**
     * Boot the model.
     *
     * @return void
     */
    public static function boot()
    {
        parent::boot();

        static::creating(function ($user) {
            $user->token = str_random(30);
        });

        static::created(function ( $user) {        

           EventDispatcher::fire('UserCreated');   

        });
    }


    /**
     * Confirm the user.
     *
     * @return void
     */
    public function confirmEmail()
    {
        $this->verified = true;
        $this->token = null;

        $this->save();
    }    

}

I also tried changing the code to

  use Billable, TwoFactorAuthenticatable,CanJoinTeams, EventDispatcher;

and replacing the boot part with

 static::created(function ( $user, EventDispatcher $event) {        

       $event->fire('UserCreated');   

    });

But it gave me another error

App\User cannot use Illuminate\Contracts\Events\Dispatcher - it is not a trait

How do I fire the event once the model has been created ?

via Chebli Mohamed