That, too, was locked or bolted on the inside. 
( That ( , ( too ( , ( ( was ( ( ( locked or ) bolted ) ( on ( the inside ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (DT That)) (, ,) (ADVP (RB too)) (, ,) (VP (VBD was) (VP (VBN locked) (CC or) (VBN bolted) (PP (IN on) (NP (DT the) (NN inside))))) (. .)))
The door was unlocked.
( ( The door ) ( ( was unlocked ) . ) )
(ROOT (S (NP (DT The) (NN door)) (VP (VBD was) (ADJP (JJ unlocked))) (. .)))