Call to undefined method Illuminate\Database\Query\Builder::save()

So I'm using Spark and I want to retrieve a user so I do the following but I get the error

Call to undefined method Illuminate\Database\Query\Builder::save()

These are classes I include:

use Illuminate\Http\Request;
use App\Http\Requests;
use Laravel\Spark\Spark;
use Twocheckout;
use Twocheckout_Sale;
use Twocheckout_Error;
use Laravel\Spark\Subscription;
use Laravel\Spark\LocalInvoice;
use App\User;

Here is how I retrieve User model.

        $user = User::all()->where('email', $data['user_email'])->first();

I cannot do this.

        $user = User::where('email', $data['user_email'])->first();

It has to have ::all()

And then when I try to save

$user->save();

PhpStorm says the method doesnt exist.

What am I doing wrong???