Change Password In Laravel 5.4

I've add code to change password in my webapp. But Hash::check() doesn't work. Always return false. Also Hash::Make() returns different string every time. I've tried bcrypt() instead but, it also doesn't work. Please help me. Here's my code.

public function changePassword(Request $request)
{
    $user = Auth::user();

    $curPassword = $request->input['curPassword'];
    $newPassword = $request->input['newPassword'];

    if (Hash::check($curPassword, $user->password)) {
        $user_id = $user->id;
        $obj_user = User::find($user_id)->first();
        $obj_user->password = Hash::make($newPassword);
        $obj_user->save();

        return response()->json(["result"=>true]);
    }
    else
    {
        return response()->json(["result"=>false]);
    }
}

Thank you.

via Fred Lopes