Sequelize.js: findById() not found the data

I try to find user by Id:

User.findById(UserId).then(function (foundUser) {
    return foundUser;
});
return false;

But I get "return false". I view foundUser variable for debuggindg, and it has message

'Reference Error: foundUser is nor defined'

In console I can see query:

Executing (default): SELECT "id", "username", "email", "password", "createdAt", "updatedAt" FROM "users" AS "users" WHERE "users"."id" = 2;

And I have the user with id=2 in a db. Why it doesn't work?

via Sergei R