呢兩位人士喺進入咗公廁唔夠5秒之後
They were in the public toilet less than five seconds after entering the public toilet.

Cantonese Sentence Breakdown

呢 ni1
this
兩 loeng5
two
both
some
a few
tael, unit of weight equal to 50 grams (modern) or 1
16 of a catty 斤jīn [斤] (old)
a group of about ten people
位 wai6
position
location
place
seat
classifier for people (honorific)
classifier for binary bits (e.g. 十六位 16-bit or 2 bytes)
throne
post
rank
status
人士 jan4 si6
(noun) (A formal word of) folks
喺 hai2
in
進入 zeon3 jap6
(phrasal verb) Get in
咗 zo2
Cantonese particle equivalent to 了le [了] or 过guò [过], a particle used to indicate perfective aspect for continuous state
completed actions
past events
change of situation
公廁 gung1 ci3
(noun) Public washroom
唔 ng4
oh (expression of agreement or surprise)
(Cantonese) not
to hold in mouth
to bite
夠 gau3
to reach
to be enough
adequate
tired of
fed up with
too
秒 miu5
second (of time)
unit of angle or arc equivalent to one sixtieth of a degree
beard of corn or grain
之後 zi1 hau6
after