The HK website suggests they are closed (again). "We are not currently open due to Covid-19 but we expect to reopen soon. However, Hotel Cascadas directly above the club is open. Keep checking our website and social media for opening date announcements."
Read an update on border crossings. Seems going to Mexico will only require a temperature check, and questions about your health and recent countries visited. Getting back into the US from Mexico is NOT an issue for US Citizens, restrictions apply to non-citizens.
https://www.bajabound.com/travelupdates/borderupdate.php
https://www.gob.mx/inm/prensa/mantiene-inm-coordinacion-con-autoridades-sanitarias-en-zonas-de-internacion-estaciones-y-estancias-migratorias-de-mexico-238576
I used the HK shuttle almost exclusively unless I was in a rush to get back to the border. The shuttle garage is 1/2 block from Ped West with a waiting room and off the main street.
Comments made by ncc1701