Laravel multiple delete checkbox?

I want to delete only checked tasks. At the moment I have this:

<form method="POST" action="/destroy">
@foreach($tasks as $t)
<label>            
<input type="checkbox" name="checked[]" value="$t->id">                    
</label> 
  @endforeach  
<button type="submit">Submit!</button>
</form>

This is my Controller

public function destroy(Request $request)
    {
        $this->validate($request, [
            'checked' => 'required',
        ]);

        $checked = $request->input('checked');

        Task::destroy($checked);
    }

And this is my route

Route::post('/destroy', [
    'uses' => 'Controller@destroy',
]);

I don't get no error but the system does not work