As mentioned, Apollo suits are neither safe, nor in working condition now. Even the EVA suits on the ISS (which are only usable for space walks) are decades old and just barely being kept going.

The US simply hasn't been able to bring new spacesuits into use for a long time, every single time, the costs and timelines have spiraled. Probably because a lot of the knowledge has been lost to old age, and the new guys need some time to relearn those lessons and improve on them.