A man in work clothes is holding a chain.
A person getting ready to lock his bike up before work.
Just because a man is holding a chain does not mean he is getting ready to lock his bike up before work. We do not know what kind of chain and the sentence does not mention a bike or where the man is about to go.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_hold(e1) & n_chain(x4) & in(x1,x2) & n_clothes(x2) & of(x2,x3) & n_work(x3) & n_man(x1))
exists e1 p1 x1 x2 x3.(a_topic(x1) & exists p2 s1.(Topic(s1,p2) & Actor(s1,x2) & a_ready(s1) & exists e2 s2 x4.(before(e2,x4) & n_work(x4) & a_up(s2) & Manner(e2,s2) & Theme(e2,x3) & Actor(e2,x2) & v_lock(e2))) & n_bike(x3) & of(x3,x1) & n_male(x1) & Topic(e1,p1) & Actor(e1,x2) & v_get(e1) & (x1 = x2) & n_person(x1))