Depends on how tight it is.
The escape artist skill defines a tight space to be
CRB wrote:
a space where your head fits but your shoulders don’t. If the space is long you may need to make multiple checks. You can’t get through a space that your head does not fit through.
It also says such a check takes one minute, which presumably means you cannot take other actions during that time.
For a medium or small creature, a five ft square is called out as the minimum space to 'fight comfortably'. Obviously more than one human can fit in a five foot square, but they couldn't all take the normal attack or full attack actions.
If you have at least a five foot square (for a medium or small creature), you can make a full attack unless there is some special circumstance preventing you.
Oh, wait, THAT kind of squeezing, I missed the most obvious interpretation of the question. Thanks Nefreet!
