After the recent update red x method for Cerberus isn't working anymore
https://streamable.com/dh27tj heres video
UPDATE: You can still do the red x by clicking on the door every tick instead of just the once, this also seems to be an unintended patch that will be repaired at a later date, for now you just will have to risk RSI doing the method vid below:
https://streamable.com/4tw2hz