An algorithm is designed to restrict access to a high-security vault by tracking user passcode attempts. The pseudocode for this algorithm is shown below:

1  attempts ← 0
2  is_valid ← False
3  WHILE is_valid = False AND attempts < 3 DO
4      passcode ← USERINPUT
5      IF passcode = "90210" THEN
6          is_valid ← True
7      ELSE
8          attempts ← attempts + 1
9      ENDIF
10 ENDWHILE

Identify the line number where indefinite iteration is first initiated in this algorithm.