q to toggle sprint e to crouch (toggle sprint off if you don't want to slide) you auto-open a door that isn't jammed, but have to slide into a jammed door and w to go against the wall. You automatically move, you just have to catch the spots when chased, and use your mouse to look around. You slide to get through the small spots and break through some doors. This is infinity mode. no timers, just keep on going.
Credits to the original developer who made grace (it's on Roblox) and I just recreated the assets from grace.