Any employer is required to file a W-2 if they pay any wages, even for 1 day's work.
You are mistaken about the filing requirements. If your spouse files a tax return and you file married filing jointly, you must include your income no matter how little. If you decide to file as married filing separately, then you do not have to file a tax return if your spouse uses the standard deduction. However, married filing separately may result in your spouse paying more tax. And if your spouse itemizes their deductions then you must file if your income is more than $5.