Your front door is common property. You can’t change common property without permission either by application to the OC or contained in a by-law.
The Act doesn’t say anything about locks specifically so you have to assume they come under this section
Part 4 Property management
111 Work by owners of lots affecting common property
An owner of a lot in a strata scheme must not carry out work on the common propertyunless the owner is authorised to do so:
(a) under this Part, or
(b) under a by-law made under this Part or a common property rights by-law, or
(c) by an approval of the owners corporation