Unable to answer "What are the opening hours here?" – poc (Shoe Store) – https://osm.org/node/11096800466 via StreetComplete 58.2:

Poc and next point "protezēšanas un ortopēdijas centrs" are the same place. It looks like it's a medical center combined with orthopedics shop. Entrance is closer to the side of the building near gates. There is also medical laboratory E. Gulbja Laboratorija in the same place, Mon-Fri 8:00-16:00.

Attached photo(s):
https://westnordost.de/p/230789.jpg