Compliance with the access control policy

COVID-19 represents a significant change in the organizational context, so according to ISO 27001, clause 8.3, you must perform a risk assessment to identify if new risks have arisen (e.g., related to access control when working from home), or if current risks have changed. Based on the results of this new risk assessment you can decide if the access control policy needs change or not. This way you can ensure your access control policy will continue compliant with standards requirements.

Specifically about the use of cards and biometrics, maybe you should consider implementing an alternative way of identification and authentication (e.g., locks with keys only) in pair with video monitoring, or adopting cleaning practices in the input devices, according to manufacturers' recommendations. 

This article will provide you a further explanation about risk assessment and risk treatment:

• ISO 27001 risk assessment & treatment – 6 basic steps https://advisera.com/27001academy/knowledgebase/iso-27001-risk-assessment-treatment-6-basic-steps/

These materials will also help you regarding risk assessment and risk treatment:

• Book ISO 27001 Risk Management in Plain English https://advisera.com/books/iso-27001-annex-controls-plain-english/