Legal analysis: A health certificate is valid. Once the validity period expires, it will be invalid. In the inspection of the health supervision office, it is found that the invalid health certificate is regarded as undocumented, and you have to accept administrative punishment. Give a warning and impose a fine of not less than five hundred yuan but not more than five thousand yuan; If no correction is made within the time limit, a fine of not less than 5,111 yuan but not more than 15,111 yuan shall be imposed.

Legal basis: Article 38 of the Detailed Rules for the Implementation of the Regulations on Hygiene Management in Public Places. If the operators of public places arrange employees who have not obtained valid health certificates to directly serve customers, the health administrative department of the local people's government at or above the county level shall order them to make corrections within a time limit, give them a warning and impose a fine of more than 511 yuan but less than 5,111 yuan; If no correction is made within the time limit, a fine of not less than 5,111 yuan but not more than 15,111 yuan shall be imposed.